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 A068216 #23 Aug 11 2024 14:41:34 %S A068216 341,1105,10261,101101,1004653,10004681,100017223,1001152801, %T A068216 10000321321,100004790097,1000001376901,10000130243671, %U A068216 100000105970311,1000000191735161,10000006286491369,100000010102756401,1000000114865704261,10000000494514450733 %N A068216 a(n) is the smallest n-digit pseudoprime (to base 2). %H A068216 P. De Geest, <a href="https://www.worldofnumbers.com/em125.htm">Smallest n-digit pseudoprimes (base 2)</a> %H A068216 <a href="/index/Ps#pseudoprimes">Index entries for sequences related to pseudoprimes</a> %Y A068216 Cf. A001567, A067845, A001262, A062568, A062852. %K A068216 nonn,base %O A068216 3,1 %A A068216 _Patrick De Geest_ and _Shyam Sunder Gupta_, Feb 21 2002 %E A068216 One more term from _Farideh Firoozbakht_, Jan 10 2007 %E A068216 More terms from _Jens Kruse Andersen_, May 11 2008 %E A068216 Offset corrected by _Arkadiusz Wesolowski_, Dec 14 2011