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 A067845 #17 Jun 30 2019 10:42:05 %S A067845 645,8911,93961,997633,9995671,99971821,999828727,9999109081, %T A067845 99983971501,999986341201,9999946514845,99999856404001, %U A067845 999994510007533,9999999191658001,99999984319096601,999999995115616561,9999999995077192591 %N A067845 Largest n-digit pseudoprime (to base 2). %H A067845 Patrick De Geest, <a href="http://www.worldofnumbers.com/won125.htm">Smallest n-digit Pseudoprimes</a> %H A067845 <a href="/index/Ps#pseudoprimes">Index entries for sequences related to pseudoprimes</a> %e A067845 a(2)=8911, so largest pseudoprime (base 2) of 4 digits is 8911. %Y A067845 Cf. A001567, A068216, A001262, A062568, A062852. %K A067845 hard,nonn,base %O A067845 3,1 %A A067845 _Shyam Sunder Gupta_, Feb 14 2002 %E A067845 More terms from _Farideh Firoozbakht_, Jan 11 2007 %E A067845 a(17)-a(19) from _Amiram Eldar_, Jun 30 2019