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 A292338 #7 Aug 26 2021 08:23:16 %S A292338 1,7,203,11977,154553,353423,4482037,9904979,20851957,69262991, %T A292338 264440183,6824905927,7803226417,17244568439,47773414171,57280493557, %U A292338 120586867331,197922271883,218692031341,249815987281,409580786629,460390358603,802768833013,963574941161,1003238606531,1146808373599,1385429010959,1529257578289 %N A292338 Numbers k such that k^2 divides 13^k + 1. %H A292338 Max Alekseyev, <a href="/A292338/b292338.txt">Table of n, a(n) for n = 1..51</a> %Y A292338 Subsequence of A015963. %Y A292338 Cf. A128393, A177813. %K A292338 nonn %O A292338 1,2 %A A292338 _Max Alekseyev_, Sep 16 2017