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 A176245 #4 May 01 2013 21:06:47 %S A176245 3,37,160001 %N A176245 Primes of the form A174881(k)+1. %C A176245 There are no primes of the form A174881(k)-1. %C A176245 There are no further terms through ((40*(40+1))^40) + 1 = 52330005981567385600000001 * 7498996269037701079813541255115132352481561590213553612395236504891175431182405289081378432614400. %C A176245 Contribution from _Farideh Firoozbakht_, Apr 22 2010: (Start) %C A176245 Each term is of the form (4^n+2^n)^2^n+1. Next term (if it exists) is %C A176245 greater than (4^15+2^15)^2^15, so it has more than 295924 digits. (End) %e A176245 a(1) = (1^1)*((1+1)^1) + 1 = 2 + 1 = 3 is prime. %e A176245 a(2) = (2^2)*((2+1)^2) + 1 = 36 + 1 = 37 is prime. %e A176245 a(3) = (4^4)*((4+1)^4) + 1 = 160000 + 1 = 160001 is prime. %Y A176245 Cf. A000040, A000169, A000312, A174881. %K A176245 bref,more,nonn %O A176245 1,1 %A A176245 _Jonathan Vos Post_, Apr 12 2010 %E A176245 Edited by Farideh Firoozbakht and _N. J. A. Sloane_, Apr 18 2010