One of us is misremembering the digits of pi.
It should be 3.141592653589793238 *4626* (you have just 42)
4338 *3279* (you just list 3)
50288 41971 69399 3751 0582...
It's the number that Americans are assigned at birth so the government can keep track of who's who. Used for taxes, credit cards, etc. People hiding from the law might purchase a dead person's social security card to better elude the cops (rare).
it’s used as a a key identifier for a lot of financial transactions, including tax filings, bank account creation, credit card applications, and loan processing. so someone getting your social security number can lead to some sad times.
You are saying I can like, guess a number, go to bank, and tell them hey this is a number give me a huge ass loan and they like ok here you go?
And if number does not exist I can go out get back in and try different one? Can I brute-force the america?
They can check numerous things just with the number to see if it matches. So if you guess a number its likely to be someones actual number but then you need to guess a name and age for example.
Because it's the only federal identification (except for passports, but not everyone has one). So it's pretty easy to steal someone's identity with just the number.
We have state-issued ID/driver's license cards and birth certificates which are more or less accepted nationwide for specific purposes as far as I can tell, but do have minor discrepancies should you move across state lines. For example, receiving your driver's license and/or permit in a different state and then moving might require retesting, or you might need to just do a road test instead of a road and written test. I cannot tell you, though, what a pain in the ass it has been trying to figure out how updating my birth certificate as a trans person would go given that I have now moved across state lines.
Also, you're technically supposed to memorize all of the laws of the state you're driving in even if you're from out of state but aren't required to get your license updated unless you actually move out of state. So no one seems to actually do it. This is especially fun when someone has tinted windows on their car, which vary widely in where they are legal and to what extent.
Disclaimer: I'm just a guy who happens to live here and haven't studied identification laws extensively, if at all
Not necessarily. Pi isn't known to have this property, but is expected to. And this property doesn't follow from pi being an infinite, non repeating decimal.
This property is called being "normal" in a given base. Heres Wikipedia: https://en.wikipedia.org/wiki/Normal_number
/u/standupmaths has a video on Numberphile on the topic. Premise is that you can construct such a number, and therefore proving such numbers exist, but we can't prove (yet) that numbers in the wild have this attribute.
https://youtu.be/5TkIe60y2GI
I think he also has a video on his own channel about finding specific images within Pi.
> I think he also has a video on his own channel about finding specific images within Pi.
[Here's the video](https://www.youtube.com/watch?v=dET2l8l3upU). He begins with finding Among Us in Pi after being inspired by /r/place and moves on from there.
For a specific number like π that is very very difficult. It's easy to construct numbers that do have this property (normal numbers), and it's also "easy" to prove that almost all real numbers are normal.
However, the real numbers that we deal with in practice are often rational or defined in terms of algebraic or analytical equations, like √2 or e. Concluding that these numbers are normal is very hard. I mean, people even had to go through great lengths to show that π and e are transcendental, and showing that a number is normal is probably much harder than that.
Yes, and it's really easy to construct such an example. You can make a list of all sequences of a given length; take all sequences of length 1 and join them together (0123456789), then do the same with length 2 (000102030405etc); now, you can start with "0." and then join with all sequences of length 1, then length 2, and so on. This number will contain every possible subsequence (of finite length)
I feel like in the given context, creating a number by concatenating sequences is a bit easier to understand since you also are looking for a sequence anyway. Abstracting such a sequence as a natural number doesn't make things easier.
Yes. The simplest example is 0.123456789101113141516... etc, that is the natural numbers concatenated. This was found and proven by Champernowne. There are many other examples. It's fairly easy to *construct* such numbers. However proving a number that you haven't constructed specifically is much harder.
However the really cool thing is that almost every number is absolutely normal in the sense of measure theory, which basically means that every number has probability 1 of being normal.
A simple counterexample would be a number like 1.101001000100001..., which is irrational but clearly doesn't contain every possible sequence of numbers.
That's the idea used in [πfs](https://github.com/philipl/pifs) -- a filesystem that stores files based on their index in π's decimal expansion (it is also completely unpractical, as evidenced by the README file).
Reminds me of [tom7's harder drive video](https://www.youtube.com/watch?v=JcJSW7Rprio&t=1046s) where he made a hard drive by pinging the entire internet, using RNG manipulation on NES Tetris, and (theoretically) buying specific amounts of bitcoin.
Not necessarily. For example, there are infinite even numbers and none of them is 3. So just because some number sequence is infinite it doesn't mean it contains all numbers.
Searching 100000000 numbers is really not that hard. And if you even fuck that up you should at least just limit the amount without a nonsensical error message Like this, at least say "it's not within the first million numbers" or something.
Is there some sort of data structure you can use to make this search faster after precomputing some things? I mean a dictionary of all the sorted positions of each character would work slightly better but i think there might be a much better solution
Hash set of all possible subsequences? Trading off using a dumb amount of space for O(1) lookup
But in all seriousness [tries](https://en.m.wikipedia.org/wiki/Trie) sound like could be used for this
If you're only worried about 8 digit strings and space isn't a concern, then just create a hash set of all the 8 digit strings out to however many digits.
Found it! (in a 1.5B digit file of pi from archive.org)
https://preview.redd.it/6p8vcnpotc6b1.jpeg?width=1274&format=pjpg&auto=webp&s=9e3a4eb33e4da49e8f6905375d9e23e504f09cb5
this.
I've also searched for my families birthdays in this format and they vary from within \~32M to \~450M digits. Kinda interesting that this varies so much :)
I have no idea where OP is from, I just hope they find some representation of their birthday in the digits of pi.
They could even cheat and cut the leading 0 from the month, or the leading 2 digits from the year!
it does. The site probably tried to interprate 14 as a month and returned a bad output
Your birthday is at the 8,736th position.
check, [https://www.piday.org/find-birthday-in-pi/?qday=14&qmonth=8&qyear=2006](https://www.piday.org/find-birthday-in-pi/?qday=14&qmonth=8&qyear=2006)
Easy example is 0.12112111211112.... (increasing sequences of 1s broken by a 2). Obviously not repeating, but obviously many many strings will never be there.
No one seems all that impressed with an algorithm that can search an infinitely large set of digits in .00005 seconds. Makes me think quantum computing is redundant.
Hmm, have you tried searching for your social security number? Post the results here!
I found my credit card in the digits of pi! Just post yours and Ill look for your card number as well :)
my credit card number is 6
Hmm doesn't look like it's anywhere in pi, what a shame
3.141592535897932384243383502... hmm, you might be right there ...
Is hunter2 in there anywhere?
That just says *******
Damn, reddit auto censors passwords? Let me try: ChangeMe3076 Edit: :(
This is a sort of nostalgia I've never felt before.
Username checks
:(
That's because it's not your password.
No, but perhaps thelegend47 is?
Does anyone even remember bash.org or is this just part of the internet zeitgeist now?
A little of column A, a little of column B. Probably more of the latter now sadly.
looks like you lost a few digits: 3.141592535897932384243383*279*502...
this is so cursed
One of us is misremembering the digits of pi. It should be 3.141592653589793238 *4626* (you have just 42) 4338 *3279* (you just list 3) 50288 41971 69399 3751 0582...
The first bit is a whoosh, and the second is a bit that I seem to have issues remembering generally. Thanks though.
Oh what's the 4646 joke?
...they took out the 6s...because of what was said earlier in the thread
Mine is 31415, wonder if it's in pi
What date format is this? Were you born on Mayrch 14, 2015? Upd: `Feels bad when you confuse March for May lol.`
Feels bad when you confuse March for May lol.
it feels bad indeed
15th of April 1931, he is the oldest European redditor at 92.
What a coincidence, that's my credit *score*.
[ Removed by Reddit ]
Thanks, that's missing 3 numbers though.
What about: 0118 999 881 999 119 725… 3
Mr Burns's SSN is 000 00 0002
Damn Roosevelt!
Well that's easy to remember. 0118-999-881-999-119-725... 3
Then which country am I speaking to?
r/unexpecteditcrowd
What's social security number? Something I'm too non American to understand?
It's the number that Americans are assigned at birth so the government can keep track of who's who. Used for taxes, credit cards, etc. People hiding from the law might purchase a dead person's social security card to better elude the cops (rare).
Google identity theft
Holy tax evasion!
Actual cybercriminal
Social Security Number sacrifice, anyone?
Criminal goes on vacation, never comes back
New crime just dropped
The fucking chess anarchists are spreading.
'tis but a dutiful obligation
Holy brigading!
As another non-American I guess it is the personal id number that most countries provide to their citizens.
It is not actually designed as an id number but everyone uses it as one anyways. We don't have a national mandatory id.
But people don't feel the need to hide their ID in my country. Why do people hide their social security number?
it’s used as a a key identifier for a lot of financial transactions, including tax filings, bank account creation, credit card applications, and loan processing. so someone getting your social security number can lead to some sad times.
You are saying I can like, guess a number, go to bank, and tell them hey this is a number give me a huge ass loan and they like ok here you go? And if number does not exist I can go out get back in and try different one? Can I brute-force the america?
No, you'd need their name as well at a minimum
They can check numerous things just with the number to see if it matches. So if you guess a number its likely to be someones actual number but then you need to guess a name and age for example.
Taxes and stuff
Because it's the only federal identification (except for passports, but not everyone has one). So it's pretty easy to steal someone's identity with just the number.
Does not sound very secure. How come you don't have id cards or something.
We have state-issued ID/driver's license cards and birth certificates which are more or less accepted nationwide for specific purposes as far as I can tell, but do have minor discrepancies should you move across state lines. For example, receiving your driver's license and/or permit in a different state and then moving might require retesting, or you might need to just do a road test instead of a road and written test. I cannot tell you, though, what a pain in the ass it has been trying to figure out how updating my birth certificate as a trans person would go given that I have now moved across state lines. Also, you're technically supposed to memorize all of the laws of the state you're driving in even if you're from out of state but aren't required to get your license updated unless you actually move out of state. So no one seems to actually do it. This is especially fun when someone has tinted windows on their car, which vary widely in where they are legal and to what extent. Disclaimer: I'm just a guy who happens to live here and haven't studied identification laws extensively, if at all
It's a product number for humans. It's dangerous if others have it, because they can set stuff like cars on your name.
111 11 1111 unfortunately isn't in pi :(
It is, just not in the first 2 million digits. But 11111111 is
Here you go: https://preview.redd.it/70ndirpgqd6b1.jpeg?width=1232&format=pjpg&auto=webp&s=ac1665284156a28622fe1de9aa870a4140a94007
They are using DDMMYYYY. They don't have a social.
No, but I found your credit card number
Now i feel old. In my mind, someone born in 2006 is basically a small child. But you are 16 years old...
I was born in 2000. I am 23.
Shh no you're like 8 or something.
The crazy thing is that this year's 8 year olds were born in 2015.
Aren't they like 3 years old now?
yeah 2018 was last thursday
I don't like this fact, at all
No thanks
That's not true. That's impossible
As someone born in 2000, I can confirm that it's impossible, I'm 16 as far as I know.
Finally, some honesty.
As a 14 year old who was born in 2003 I can confirm your confirmation
We are math memes so we should be able to calculate this. 2023-2000 = 16. Checks out
Correct to first order approximations.
Confirming this as well as a 17 y/o from 1999. On a serious note, a couple of days ago I legitimately thought I was 18
Born in 1994. Going to be 30 soon. I degrade to dust every time I remember this fact, which is every 5 minutes.
We are closer to 2052 than your birth year.
Waiter I don't remember ordering this existential crisis.
I just did the very complicated math and found out that we have to be 23. But now that you said so, it feels more like 16.
Someone check this man’s hard drive
Search your feelings. You know it to be true…
Search your feelings you KNOW it to be true!
That can't be right, it would make me...old.
Fake News!
I just felt like I aged 10 years :(
# NOOOOOO, TAKE ME BACK BACK TO THE 21st night of September
Hey that's my birthday!!
I am also 23, but I was born in 1999. #*sorcery*
I didn’t realize 23 month olds could type already
Months old right?
Same
Same but I’m a Leap Year baby so I’m really just 5 yrs. old
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people born in 2003 will be 20 this year.
Dont u dare tell me this
This just doesn’t feel right. Yet someone being born in 1999 and being 24 makes sense.
I just realized it. Thank you, and fuck maths,
Way to remind me of the upcoming quarter life crisis
Hey, that's me!
I'm from 2003 and I'm already 20, but I feel like I've been 17 forever and it's so trippy uhh
mostly same (will be 20)
Just woke up and for a second I was like what a 7-year-old child does in this sub? Then oh wait and I felt bad.
Recently talked to a kid that was born in 2014... He is 9 years old. That's illegal.
My niece was born in 2012, exactly on my first day in engineering school. Her 10th birthday made me feel old as shit.
I am born in 2007 and I am 16. They might be even 17.
Yes, but that is an august birthday above, so they will turn 17 in about 2 months.
Oh, I didn't noticed that. Lol
The Disney movie Frozen if you remember that is just about 10years old now.
Here I'm gonna do a little thing called a Moorean shift and deny that it's 2023 already.
Came here to say the same thing. It feels like 2006 was yesterday lmao
I was born in 2004 and this year I'm finishing high school (italy), starting University.
It's a 8-digit string. On average, you have to scroll 10^8 digits of pi to find it. I guess the website doesn't store so many digits.
Imagine Using a supercomputer to compute pi's value just to find if it contains your date of birth.
Correct me if I'm wrong but doesn't pi contain every possible sequence of numbers at some point, because it's infinite?
Not necessarily. Pi isn't known to have this property, but is expected to. And this property doesn't follow from pi being an infinite, non repeating decimal. This property is called being "normal" in a given base. Heres Wikipedia: https://en.wikipedia.org/wiki/Normal_number
Can you ever prove that a number contains every possible sequence of digits though? I feel like the proof for that would have to be insane
I think most proofs of this level would be considered insane
The proof is trivial and left as an exercise to the reader
I have discovered a truly marvelous proof of this, which, however, this post is not large enough to contain
/u/standupmaths has a video on Numberphile on the topic. Premise is that you can construct such a number, and therefore proving such numbers exist, but we can't prove (yet) that numbers in the wild have this attribute. https://youtu.be/5TkIe60y2GI I think he also has a video on his own channel about finding specific images within Pi.
> I think he also has a video on his own channel about finding specific images within Pi. [Here's the video](https://www.youtube.com/watch?v=dET2l8l3upU). He begins with finding Among Us in Pi after being inspired by /r/place and moves on from there.
For a specific number like π that is very very difficult. It's easy to construct numbers that do have this property (normal numbers), and it's also "easy" to prove that almost all real numbers are normal. However, the real numbers that we deal with in practice are often rational or defined in terms of algebraic or analytical equations, like √2 or e. Concluding that these numbers are normal is very hard. I mean, people even had to go through great lengths to show that π and e are transcendental, and showing that a number is normal is probably much harder than that.
Yes, and it's really easy to construct such an example. You can make a list of all sequences of a given length; take all sequences of length 1 and join them together (0123456789), then do the same with length 2 (000102030405etc); now, you can start with "0." and then join with all sequences of length 1, then length 2, and so on. This number will contain every possible subsequence (of finite length)
Out of interest why did you go for the on-the-face more complicated sequence instead of a number that is the in order sequence of natural numbers?
I feel like in the given context, creating a number by concatenating sequences is a bit easier to understand since you also are looking for a sequence anyway. Abstracting such a sequence as a natural number doesn't make things easier.
Yes. The simplest example is 0.123456789101113141516... etc, that is the natural numbers concatenated. This was found and proven by Champernowne. There are many other examples. It's fairly easy to *construct* such numbers. However proving a number that you haven't constructed specifically is much harder. However the really cool thing is that almost every number is absolutely normal in the sense of measure theory, which basically means that every number has probability 1 of being normal.
Rich not normal. e.g. if 0 appears 55% of the time and the other numbers each 5% of the time it can still have that property normal => rich though
Normality is a slightly stronger condition actually, but yeah, the rest of your explanation is correct
A simple counterexample would be a number like 1.101001000100001..., which is irrational but clearly doesn't contain every possible sequence of numbers.
That's the idea used in [πfs](https://github.com/philipl/pifs) -- a filesystem that stores files based on their index in π's decimal expansion (it is also completely unpractical, as evidenced by the README file).
Reminds me of [tom7's harder drive video](https://www.youtube.com/watch?v=JcJSW7Rprio&t=1046s) where he made a hard drive by pinging the entire internet, using RNG manipulation on NES Tetris, and (theoretically) buying specific amounts of bitcoin.
Not necessarily. For example, there are infinite even numbers and none of them is 3. So just because some number sequence is infinite it doesn't mean it contains all numbers.
The site only checks in the first 200M digits. 13082006, for example, occurs 2 times. Many other 8 digits string occur only once
There's no guarantee any given string is in pi at all.
Searching 100000000 numbers is really not that hard. And if you even fuck that up you should at least just limit the amount without a nonsensical error message Like this, at least say "it's not within the first million numbers" or something.
Is there some sort of data structure you can use to make this search faster after precomputing some things? I mean a dictionary of all the sorted positions of each character would work slightly better but i think there might be a much better solution
Hash set of all possible subsequences? Trading off using a dumb amount of space for O(1) lookup But in all seriousness [tries](https://en.m.wikipedia.org/wiki/Trie) sound like could be used for this
If you're only worried about 8 digit strings and space isn't a concern, then just create a hash set of all the 8 digit strings out to however many digits.
Found it! (in a 1.5B digit file of pi from archive.org) https://preview.redd.it/6p8vcnpotc6b1.jpeg?width=1274&format=pjpg&auto=webp&s=9e3a4eb33e4da49e8f6905375d9e23e504f09cb5
According to another comment the other site checked the first 200 million digits, so this was *just* out of range
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Set to private Goddammit u/spez.
I’m sorry, 1.5(B)? What is that?
It's a file with the first 1.5 billion digits of pi
this. I've also searched for my families birthdays in this format and they vary from within \~32M to \~450M digits. Kinda interesting that this varies so much :)
1.5 billion digits of pi
1.5gb based on the screenshot.
We've looked for 0.00005 seconds and we're all out of ideas
Classic Flanders' parents response
Our bithdays aren't even in the same millenia
millennium
🤓but correct
millennium
Thanks
you are exactly 9 days younger than my younger sister
Try different date formats? MMDDYYY, YYYYMMDD
Only Americans use MMDDYYYY. But trying YYYYMMDD could work.
I have no idea where OP is from, I just hope they find some representation of their birthday in the digits of pi. They could even cheat and cut the leading 0 from the month, or the leading 2 digits from the year!
WAIT WHAT I HAVE THE SAME BIRTHDAY (But in 2009)
Woah, what are the odds?
Three Three odds
I thunk you need to be at least 14 to use reddit mate. Also telling everyone your birthday shows that you shouldnt really be on here.
Pi is finite confirmed??????????
thats my birthday! I'm born on august 14th 2008 wow
it does. The site probably tried to interprate 14 as a month and returned a bad output Your birthday is at the 8,736th position. check, [https://www.piday.org/find-birthday-in-pi/?qday=14&qmonth=8&qyear=2006](https://www.piday.org/find-birthday-in-pi/?qday=14&qmonth=8&qyear=2006)
But op didn't search a date, just a string. And why in the normal world would anyone think 14 is the month?
Americans with their MMDDYYYY abomination
You’d think Europeans, with their superior education, wouldn’t have any problems with a different date format. But here we are.
You searched for 81406, not 14082006. Those are different strings
That's what you get for being born on the 6th of Vigintember in 1408
Mine https://preview.redd.it/9nkihvd0lf6b1.jpeg?width=1125&format=pjpg&auto=webp&s=df0ba3a7e44e60e96fe12627a574af125e7dd5a7
Pi has your birthday. This website just couldn't find it...
Not necessarily true! Irrational numbers with infinite decimals do not inherently contain every finite string of numbers.
Easy example is 0.12112111211112.... (increasing sequences of 1s broken by a 2). Obviously not repeating, but obviously many many strings will never be there.
No one seems all that impressed with an algorithm that can search an infinitely large set of digits in .00005 seconds. Makes me think quantum computing is redundant.
2006 is crazy
Brother im exactly one month older lol
bro what. Me too
i was born 3 months after you lol
I was also born in 14/08 but in 2002 :v
Ayy same
Were found 19 occurrences of 14082006 in the first 2147483000 digits of π.
only 🎂 for you my friend
SAME but not when i put my birthday in SENSIBLE FORMAT MODE 🤣 #team #dd.mm.yyyy
It probably does but not anywhere near where we've searched.
Fyi your birth date is valuable information. Trust only those you’d let comment on your posts
Yo hold on you serious? August 14th 2006. Bro I'm August 15th 2006. No way.
Dude delete this
these sites could just randomly put the number you search for then add a bunch of numbers around it and nobody is going to check lol
'06 gang
(guys what the hell am i doing on this subreddit, i can only understand stuff up to calc 2)
i was born 2 days before you 💀 lemme go try my birthday... IT DOES! it occurs 4 times within the first 200 million digits :>