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 A045583 #17 Oct 23 2021 10:06:26 %S A045583 1,2,3,4,8,9,16,21,26,27,32,63,64,81,128,136,147,189,243,256,338,441, %T A045583 512,567,609,729,903,1024,1029,1252,1323,1378,1701,1827,2048,2187, %U A045583 2312,2667,2709,3087,3969,4096,4263,4394,4401,5103,5481,6321,6561,7203,8001 %N A045583 Numbers k that divide 10^k + 2^k. %H A045583 Amiram Eldar, <a href="/A045583/b045583.txt">Table of n, a(n) for n = 1..1500</a> %t A045583 Select[Range[8100],Divisible[10^#+2^#,#]&] (* _Harvey P. Dale_, Apr 02 2011 *) %t A045583 Select[Range[8001], Divisible[PowerMod[2, #, #] + PowerMod[10, #, #], #] &] (* _Amiram Eldar_, Oct 23 2021 *) %Y A045583 Cf. A050621. %K A045583 nonn %O A045583 1,2 %A A045583 _David W. Wilson_