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 A138889 #2 Mar 30 2012 17:33:54 %S A138889 2,7,11,13,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97,101, %T A138889 103,107,109,113,127,131,137,139,149,151,157,163,167,173,179,181,191, %U A138889 193,197,199,211,223,227,229,233,239,241,251,263,269,271,277,281,283 %N A138889 Primes that are not Fermat primes. %C A138889 Primes that are not members of A019434. %Y A138889 Cf. A000040, A000217, A019434, A138837, A138888. %K A138889 easy,nonn %O A138889 1,1 %A A138889 _Omar E. Pol_, Apr 03 2008