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 A045581 #19 Oct 23 2021 10:06:23 %S A045581 1,2,4,5,8,16,25,32,34,64,125,128,205,256,512,578,625,1024,1025,1028, %T A045581 2048,2525,3125,4096,5125,8192,8405,9826,10256,12625,15625,16384, %U A045581 25625,32768,42025,63125,65536,78125,103525,128125,131072,167042,168305 %N A045581 Numbers k that divide 8^k + 2^k. %H A045581 Amiram Eldar, <a href="/A045581/b045581.txt">Table of n, a(n) for n = 1..400</a> %t A045581 Select[Range[200000], Divisible[PowerMod[2, #, #] + PowerMod[8, #, #], #] &] (* _Amiram Eldar_, Oct 23 2021 *) %Y A045581 Cf. A074603. %K A045581 nonn %O A045581 1,2 %A A045581 _David W. Wilson_