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 A108797 #10 Feb 16 2025 08:32:58 %S A108797 0,0,0,0,0,0,0,0,0,0,1,3,4,6,7,11,18,24,34,49,75,104,147,210,296,409, %T A108797 552,734,981,1311,1736,2314,3093,4139,5511,7396,9835,13106,17493, %U A108797 23270,31115,41664,55763,74739,100342,134559,180725,243566,327731,441270,594585,803252,1085426,1468777,1988905,2697846,3662239,4976375,6767707,9212942,12552513,17114780,23355139,31894014 %N A108797 Number of base-2 strong pseudoprimes (A001262) less than 2^n. %H A108797 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/StrongPseudoprime.html">Strong Pseudoprime</a> %H A108797 Jan Feitsma and William Galway, <a href="http://www.cecm.sfu.ca/Pseudoprimes/index-2-to-64.html">Tables of pseudoprimes and related data</a> %e A108797 a(12)=3 since 2047, 3277 and 4033 are the 2-SPSPs less than 4096. %Y A108797 Cf. A001262, A055552, A208276 %K A108797 nonn %O A108797 1,12 %A A108797 _Charles R Greathouse IV_, Dec 03 2005 %E A108797 a(24)-a(64) from _Charles R Greathouse IV_, Jan 28 2011, based on the calculations of Jan Feitsma. %E A108797 a(1)=...=a(10)=0 prepended by _Max Alekseyev_, Apr 23 2013