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 A020233 #19 Feb 16 2025 08:32:33 %S A020233 25,325,703,2101,2353,4525,11041,14089,20197,29857,29891,39331,49241, %T A020233 58825,64681,76627,78937,79381,87673,88399,88831,102943,109061,137257, %U A020233 144901,149171,173951,178709,188191,197633,219781,227767,231793,245281 %N A020233 Strong pseudoprimes to base 7. %H A020233 Amiram Eldar, <a href="/A020233/b020233.txt">Table of n, a(n) for n = 1..10000</a> (terms 1..200 from R. J. Mathar) %H A020233 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/StrongPseudoprime.html">Strong Pseudoprime</a> %H A020233 <a href="/index/Ps#pseudoprimes">Index entries for sequences related to pseudoprimes</a> %Y A020233 Cf. A005938, A001262, A020229, A020230, A020231, A020232. %K A020233 nonn %O A020233 1,1 %A A020233 _David W. Wilson_