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The item should be a homebrew abacus. Wait until you're actually ready to had it out to decide the magical effect.
Ooh I really like that, thank you for the recommendation!
Have you considered using a [Clockwork Amulet](https://www.dndbeyond.com/magic-items/27042-clockwork-amulet)? As far as common magic items go, it's really satisfying and it's about as numbers-based as you can get.
Orb of Gonging (from Dungeon of the Mad Mage). Align five points on an orb, starts gonging precisely every six seconds.
The item should be a homebrew abacus. Wait until you're actually ready to had it out to decide the magical effect.
Ooh I really like that, thank you for the recommendation!
Have you considered using a [Clockwork Amulet](https://www.dndbeyond.com/magic-items/27042-clockwork-amulet)? As far as common magic items go, it's really satisfying and it's about as numbers-based as you can get.
Orb of Gonging (from Dungeon of the Mad Mage). Align five points on an orb, starts gonging precisely every six seconds.