A045587 Numbers k that divide 8^k + 3^k.

1, 11, 121, 1331, 14641, 56881, 87967, 151019, 161051, 625691, 967637, 1493503, 1661209, 1771561, 6882601, 10644007, 16428533, 18273299, 19487171, 63952009, 75708611, 117084077, 180713863, 201006289, 214358881, 294131651, 454877357, 703472099, 780919249, 832794721

Offset: 1

Author

David W. Wilson

Keywords

• nonn

Crossrefs

Cf. A074609.

Programs

Mathematica

Select[Range[10^5], Divisible[PowerMod[8, #, #] + PowerMod[3, #, #], #] &] (* Amiram Eldar, Oct 23 2021 *)

Extensions

a(28)-a(30) from Amiram Eldar, Oct 23 2021