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 A128398 #24 Mar 01 2025 09:53:43 %S A128398 1,17,128583032925805678351 %N A128398 Numbers k such that k^2 divides 18^k - 1. %C A128398 17 divides a(n) for n > 1. %C A128398 a(4) > 10^50. - _Max Alekseyev_, Mar 01 2025 %Y A128398 Subsequence of A128358. %Y A128398 Cf. A127103, A127104, A127105, A127106, A127107, A127102, A127101, A127100, A127092, A128405, A128393, A128394, A128395, A128396, A128397, A128398, A128399, A128400, A128401, A128402, A128403, A128404. %K A128398 bref,hard,more,nonn %O A128398 1,2 %A A128398 _Alexander Adamchuk_, Mar 08 2007