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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.
oeis.org/search?q=1%2C2%2C3%2C15&language=english…
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.
oeis.org/search?q=1%2C2%2C3%2C15&language=english…