My favorite one for single digits is knowing that the digits in the sum will always add to 9 and the first digit will always be one less than you're multiplying by 9. (Pretty sure they always add to 9 even when you're doing bigger numbers.)
PresidentElectTheRupertDamnit
npub1r8…kfjwl
2024-08-29 20:49:25
in reply to nevent1q…9sry
Author Public Key
npub1r8u6lw8c2h67s66magtqu78vtpckfzcsmmdsg06gqm723njsunfs8kfjwlPublished at
2024-08-29 20:49:25Event JSON
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