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 A014854 #11 Jul 03 2021 16:28:59 %S A014854 1,3,7,9,21,27,57,63,81,171,189,203,243,333,399,513,567,609,729,999, %T A014854 1083,1197,1539,1701,1827,2187,2331,2943,2997,3249,3591,4617,5103, %U A014854 5481,5887,6327,6561,6993,7581,8829,8991,9567,9747,10773,11571,11977 %N A014854 Numbers k that divide s(k), where s(1)=1, s(j)=7*s(j-1)+j. %Y A014854 s(n) = A014830(n). %K A014854 nonn %O A014854 1,2 %A A014854 _N. J. A. Sloane_, _Olivier Gérard_