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 A129614 #2 Mar 30 2012 17:37:44 %S A129614 2,2,4,16,346,390410,390410,34712918410,40501164004 %N A129614 a(n) is the smallest natural number m such that 3^(3^k) + m is prime for k=0,1,...,n. %C A129614 Next term is greater than 2*10^8. %e A129614 For k=0,1,...,6 3^3^k + 390410 are prime and 390410 is the smallest number with this property so a(6)=390410. %Y A129614 Cf. A129613, A129615. %K A129614 hard,more,nonn %O A129614 0,1 %A A129614 _Farideh Firoozbakht_, May 13 2007, Jun 01 2007