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 A045600 #14 Aug 09 2021 13:57:48 %S A045600 1,13,169,2197,28561,371293,2684903,4826809,34903739,62748517, %T A045600 257734633,453748607,815730721,3185696137,3350550229,5898731891, %U A045600 10604499373,41414049781,42655053961,43557152977,76683514583 %N A045600 Numbers k that divide 7^k + 6^k. %Y A045600 Cf. A074619. %K A045600 nonn %O A045600 1,2 %A A045600 _David W. Wilson_