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 A225392 #8 May 09 2013 22:43:54 %S A225392 22155,1864149,2760681,6222765,22687797,25631319,29309589,33333069, %T A225392 36490905,56310891,60212889,74097849,76008207,80864685,84214395, %U A225392 132006225,132621171,137362521,138993381,152223885,154185525,175950081,188261481,188677335,194279955 %N A225392 Numbers b such that b^(2^n) + 2 is prime for n from 0 to 4. %C A225392 Generalized Fermat numbers of the form b^(2^n) + k with k = 2 here. %C A225392 For b = 2760681, b^(2^n) + 2 is prime for n from 0 to 5 %o A225392 (PARI) k=2;forstep(b=1,5*10^7,[4,2,2,2],i=0;for(n=0,4,m=b^2^n+k;if(isprime(m),i++;if(i>4,print([b,m,n,i]))))) %Y A225392 Cf. A070694, A225321 %K A225392 nonn %O A225392 1,1 %A A225392 _Robin Garcia_, May 06 2013 %E A225392 a(10)-a(25) from _Giovanni Resta_, May 06 2013