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 A020234 #20 Feb 16 2025 08:32:33 %S A020234 9,65,481,511,1417,2047,2501,3277,3641,4033,4097,4681,8321,11041, %T A020234 15841,16589,19561,24311,24929,29341,41441,42799,45761,49141,52429, %U A020234 52633,54161,55969,56033,59291,61337,65281,66197,74023,74665,77161,80581,85489,87061 %N A020234 Strong pseudoprimes to base 8. %H A020234 Amiram Eldar, <a href="/A020234/b020234.txt">Table of n, a(n) for n = 1..10000</a> (terms 1..237 from R. J. Mathar) %H A020234 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/StrongPseudoprime.html">Strong Pseudoprime</a> %H A020234 <a href="/index/Ps#pseudoprimes">Index entries for sequences related to pseudoprimes</a> %Y A020234 Cf. A020137, A001262, A020229, A020230, A020231, A020232, A020233. %K A020234 nonn %O A020234 1,1 %A A020234 _David W. Wilson_