A302089 Primes of form 5*k^k + 4.

139, 15629, 1937102449

Offset: 1

Author

Seiichi Manyama, Apr 01 2018

Keywords

• nonn

Comments

The next term is too large to include.

Crossrefs

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

Cf. A302088.

Programs

PARI

lista(nn) = forstep(n=1, nn, 2, if(ispseudoprime(p=5*n^n+4), print1(p, ", "))); \\ Altug Alkan, Apr 01 2018

Formula

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