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 A243010 #17 Nov 25 2019 03:29:29 %S A243010 4,124,11476,59356,80476,91636,250876,261964,482516,1385836,1926676, %T A243010 2428084,2589796,3743476,4101796,6797764,9155476,10701076,10743436, %U A243010 11263396,13799836,13859956,15570556,20396476 %N A243010 Pseudoprimes to base 5 that are not squarefree. %C A243010 Any term is divisible by the square of a base 5 Wieferich prime (A123692). %C A243010 Intersection of A005936 and A013929. - _Michel Marcus_, Aug 21 2014 %H A243010 Amiram Eldar, <a href="/A243010/b243010.txt">Table of n, a(n) for n = 1..879</a> (terms below 10^12) %o A243010 (PARI) forcomposite(n=1, 1e9, if(Mod(5, n)^(n-1)==1, if(!issquarefree(n), print1(n, ", ")))) %Y A243010 Cf. A005936, A123692, A158358, A243089, A243090, A244065. %K A243010 nonn %O A243010 1,1 %A A243010 _Felix Fröhlich_, Aug 18 2014