LMAO (thelemmy.club)
submitted 3 weeks ago by to c/linuxmemes@lemmy.world
 
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[–] 4 points 3 weeks ago

Hmmm, could be numbers k such that phi(k) divides k+1, where phi is Euler's totient function or perhaps numbers k such that every base-4 digit of k is a base-6 digit of k? Quite the puzzler.

https://oeis.org/search?q=1%2C2%2C3%2C15&language=english&go=Search

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