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 A015903 #16 Sep 13 2018 17:25:23 %S A015903 1,2,4,6,11,12,22,44,66,132,148,276,671,814,1068,2388,3498,24564, %T A015903 29234,54924,60126,80476,80526,85866,212532,234652,252967,307396, %U A015903 368668,700404,885786,1121044,1350812,1366476,1631004,1697116,1698906,1718431,1803166,2637811,3186678,3704196,4888236,8990356 %N A015903 Numbers n such that n | 11^n + 11. %H A015903 Robert Israel, <a href="/A015903/b015903.txt">Table of n, a(n) for n = 1..200</a> %p A015903 filter:= n -> 11 &^ n + 11 mod n = 0: %p A015903 select(filter, [$1..2*10^6]); # _Robert Israel_, Sep 13 2018 %o A015903 (PARI) isok(n) = Mod(11, n)^n + Mod(11, n) == 0; \\ _Michel Marcus_, Sep 13 2018 %K A015903 nonn %O A015903 1,2 %A A015903 _Robert G. Wilson v_ %E A015903 Corrected and extended by _Robert Israel_, Sep 13 2018