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 A068445 #10 Jan 28 2014 00:00:48 %S A068445 101101,129921,1837381,127665878878566721,1037998220228997301 %N A068445 Palindromic pseudoprimes (base 2). %C A068445 a(6), if it exists, is greater than 2^64. - _Charles R Greathouse IV_, Jun 29 2011 %H A068445 Patrick De Geest, <a href="http://www.worldofnumbers.com/won124.htm">Palindromic Pseudoprimes (base 2)</a> %H A068445 Carlos Rivera, <a href="http://www.primepuzzles.net/puzzles/puzz_170.htm">Puzzle 170</a> %e A068445 a(2)= 129921, So the 2nd palindromic pseudoprime(base-2) number is 129921. %K A068445 hard,more,nice,base,nonn %O A068445 1,1 %A A068445 _Shyam Sunder Gupta_, Mar 10 2002; extended Oct 20 2002