A370661 Numbers k such that (8^k + 8*k)/8 is prime.

1, 3, 7, 15, 3907

Offset

1,2

Comments

If it exists, a(6) > 50000.

Links

Table of n, a(n) for n=1..5.

Prog

(PARI) is(n) = ispseudoprime(8^(n-1) + n)

Crossrefs

Cf. A221910, A226201.

Sequence in context: A197594 A206851 A033089 * A175878 A180503 A153578

Adjacent sequences: A370658 A370659 A370660 * A370662 A370663 A370664

Keyword

nonn,hard,more

Author

Hugo Pfoertner, Feb 27 2024

Status

approved