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 A162591 #3 Mar 31 2012 12:38:25
%S A162591 3,23,229,776887,275311670611,808793517812627212561,
%T A162591 47962816398523117606189726043968411848519304708598059350620557763277694737755820158580941773369740112983781265183299561695077810144494290292906506606685128216915382107158604900927276535058149770652889252352435564631
%N A162591 Primes in A007781.
%C A162591 See A072164 for a condensed representation of the same information.
%e A162591 3^3-2^2=27-4=23 is prime and enters the list.
%t A162591 f[n_]:=n^n-(n-1)^(n-1); lst={};Do[If[PrimeQ[f[n]],AppendTo[lst,f[n]]], {n,2,5!}];lst
%Y A162591 Cf. A068955.
%K A162591 nonn
%O A162591 1,1
%A A162591 _Vladimir Joseph Stephan Orlovsky_, Jul 07 2009
%E A162591 Definition simplified, reference to A072164 and A068955 added by _R. J. Mathar_, Aug 11 2009