This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A045587 #17 Oct 23 2021 10:06:50 %S A045587 1,11,121,1331,14641,56881,87967,151019,161051,625691,967637,1493503, %T A045587 1661209,1771561,6882601,10644007,16428533,18273299,19487171,63952009, %U A045587 75708611,117084077,180713863,201006289,214358881,294131651,454877357,703472099,780919249,832794721 %N A045587 Numbers k that divide 8^k + 3^k. %t A045587 Select[Range[10^5], Divisible[PowerMod[8, #, #] + PowerMod[3, #, #], #] &] (* _Amiram Eldar_, Oct 23 2021 *) %Y A045587 Cf. A074609. %K A045587 nonn %O A045587 1,2 %A A045587 _David W. Wilson_ %E A045587 a(28)-a(30) from _Amiram Eldar_, Oct 23 2021