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 A122125 #2 Mar 31 2012 13:20:28
%S A122125 66,148,150,164,174,214,238,264,312,328,354,440,516,536,616,624,724,
%T A122125 744,774,836,940,1002,1030,1034,1038,1064,1086,1092,1108,1162,1322,
%U A122125 1394,1424,1468,1500,1630,1654,1668,1684,1694,1840,1886,1980
%N A122125 Indices n such that A122103[n] = Sum[ Prime[k]^5, {k,1,n}] is a prime.
%C A122125 Corresponding primes of form Sum[ Prime[k]^5, {k,1,n} ] are listed in A122126[n] = {32353461605953,9874820441996857,10821208357045699,...}.
%t A122125 Select[Range[2000],PrimeQ[Sum[Prime[k]^5,{k,1,#1}]]&]
%Y A122125 Cf. A122103, A122126.
%K A122125 nonn
%O A122125 1,1
%A A122125 _Alexander Adamchuk_, Aug 20 2006