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 A129931 #4 Oct 31 2013 12:17:43
%S A129931 4594309,4921129,5495989,7093057,14722021,23008891,23380471,24251167,
%T A129931 24296563,49201981,51788797,62123011,64649503,69326779,78274321,
%U A129931 88022797,95575771,100099267,125796127,128185777,129299011,130858711
%N A129931 Numbers n such that n remains prime through 7 iterations of function f(x) = 2x + 5.
%t A129931 fQ[n_] := Union[PrimeQ /@ NestList[2 # + 5 &, n, 7]] == {True}; lst = {}; Do[ p = Prime@n; If[fQ@p, Print@p; AppendTo[lst, p]], {n, 10^7}]; lst (* _Robert G. Wilson v_ *)
%Y A129931 Cf. A023243, A023274, A023304, A023332.
%K A129931 nonn
%O A129931 1,1
%A A129931 _Ray G. Opao_, Jun 06 2007
%E A129931 More terms from _Robert G. Wilson v_, Jun 06 2007