A370657 Numbers k such that A226199(k) = 7^k + k is prime.

34, 48, 8578, 18960

Offset

1,1

Comments

If it exists, a(5) > 268000. - Karl-Heinz Hofmann, Mar 02 2024

Links

Table of n, a(n) for n=1..4.

Prog

(PARI) is(n) = ispseudoprime(7^n+n)

Crossrefs

Cf. A058828, A221909, A226199, A370660.

Sequence in context: A260277 A045256 A302002 * A260475 A107355 A260468

Adjacent sequences: A370654 A370655 A370656 * A370658 A370659 A370660

Keyword

nonn,hard,more

Author

Hugo Pfoertner, Feb 24 2024

Status

approved