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 A122166 #2 Mar 31 2012 13:20:28
%S A122166 1,52,124,431
%N A122166 Numbers n such that 1 + Sum k^k (k=1..n) is prime.
%C A122166 Primes of the form A001923[n] = Sum k^k (k=1..n) are given in A073826[n] and their indices are given in A073825[n] = {2,5,6,10,30,...}.
%t A122166 s=1; Do[s=s+k^k;If[PrimeQ[s],Print[{k,s}]],{k,1,500}]
%Y A122166 Cf. A073825, A001923.
%K A122166 nonn
%O A122166 1,2
%A A122166 _Alexander Adamchuk_, Aug 23 2006