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 A015902 #13 Oct 23 2018 05:44:29 %S A015902 1,2,5,10,22,70,110,130,154,190,286,365,685,910,2002,2794,2926,6526, %T A015902 9730,15862,17290,24130,50005,59158,60346,68926,72010,131326,163306, %U A015902 278278,313045,478126,525790,552370,618046,642874,883246 %N A015902 Numbers k such that k | 10^k + 10. %H A015902 Giovanni Resta, <a href="/A015902/b015902.txt">Table of n, a(n) for n = 1..250</a> %t A015902 Select[Range[10^5], Mod[PowerMod[10, #, #] + 10, #] == 0 &] (* _Giovanni Resta_, Oct 23 2018 *) %Y A015902 Cf. A006517, A015888, A015889, A015891, A015892, A015893, A015897, A015898, A015903, A015904, A015905, A015906. %K A015902 nonn %O A015902 1,2 %A A015902 _Robert G. Wilson v_ %E A015902 Missing a(2)-a(3) from _Giovanni Resta_, Oct 23 2018