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 A191409 #15 Feb 15 2014 15:30:20
%S A191409 5,131,54869,863585783,
%T A191409 174960197237646244878763893842845824429634127969
%N A191409 Primes of the form n*(n-1)^n-(n-1)*n^(n-1)-1.
%C A191409 a(6) and a(7) have 427 and 1773 digits, respectively, and are thus too large to include.
%e A191409 a(1)=5 (=3*2^3-2*3^2-1), a(2)=131 (=4*3^4-3*4^3-1), a(3)=54869 (=6*5^6-5*6^5-1), a(4)=863585783 (=9*8^9-8*9^8-1).
%t A191409 Select[Table[n(n-1)^n-(n-1)n^(n-1)-1,{n,200}],PrimeQ] (* _Harvey P. Dale_, Jun 19 2011 *)
%Y A191409 Cf. A191699 (associated n).
%K A191409 nonn
%O A191409 1,1
%A A191409 _Juri-Stepan Gerasimov_, Jun 12 2011