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Primes of form 5*k^k + 4.
2

%I #9 Apr 01 2018 10:44:04

%S 139,15629,1937102449

%N Primes of form 5*k^k + 4.

%C The next term is too large to include.

%F a(n) = 5*A302088(n)^A302088(n) + 4.

%o (PARI) lista(nn) = forstep(n=1, nn, 2, if(ispseudoprime(p=5*n^n+4), print1(p, ", "))); \\ _Altug Alkan_, Apr 01 2018

%Y Primes of form b*k^k + b - 1: A216148 (b=2), A301811 (b=3), A301808 (b=4), this sequence (b=5), A302091 (b=6).

%Y Cf. A302088.

%K nonn

%O 1,1

%A _Seiichi Manyama_, Apr 01 2018