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 A055552 #31 Apr 22 2025 08:03:00 %S A055552 0,0,0,5,16,46,162,488,1282,3291,8607,22407,58892,156251,419489, %T A055552 1135860,3115246,8646507,24220195 %N A055552 Number of base-2 strong pseudoprimes (A001262) less than 10^n. %D A055552 Paulo Ribenboim, The Little Book of Bigger Primes, Springer-Verlag NY 2004. See p. 219. %H A055552 William Galway, <a href="http://www.cecm.sfu.ca/Pseudoprimes/index-2-to-64.html">Tables of pseudoprimes and related data</a>. %H A055552 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Pseudoprime.html">Pseudoprime</a>. %H A055552 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/StrongPseudoprime.html">Strong Pseudoprime</a>. %H A055552 <a href="/index/Ps#pseudoprimes">Index entries for sequences related to pseudoprimes</a>. %Y A055552 Cf. A001262. %K A055552 nonn,hard,more %O A055552 1,4 %A A055552 _Eric W. Weisstein_ %E A055552 Corrected by _Shyam Sunder Gupta_, Mar 04 2002 %E A055552 a(14)-a(15) from _Charles R Greathouse IV_, Aug 15 2006 %E A055552 a(16)-a(19) from _Charles R Greathouse IV_, Mar 14 2011