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 A062852 #14 Mar 01 2022 11:55:35 %S A062852 8321,90751,983401,9995671,99789673,999828727,9998721001,99973476433, %T A062852 999855751441,9998974546471,99999760517281,999985147456681, %U A062852 9999952887414577,99999984319096601,999999916795882627,9999999995077192591 %N A062852 Largest n-digit strong pseudoprimes (in base 2). %H A062852 Patrick De Geest, <a href="http://www.worldofnumbers.com/won125.htm">Smallest n-digit pseudoprimes(base 2)</a> %H A062852 <a href="/index/Ps#pseudoprimes">Index entries for sequences related to pseudoprimes</a> %e A062852 a(4)=8321 since 8321 is the largest 4-digit strong pseudoprime to base 2. %Y A062852 Cf. A001567, A068216, A067845, A001262, A062568. %K A062852 hard,nonn,base %O A062852 4,1 %A A062852 _Shyam Sunder Gupta_, Feb 13 2002 %E A062852 Edited by _Charles R Greathouse IV_, Nov 01 2009 %E A062852 a(16)-a(19) from _Charles R Greathouse IV_, Mar 14 2011