A366824 Numbers k such that gcd(2^k + 1, k! - 1) has a prime divisor different from 2*k + 1.

221799, 300081, 338884, 3652374, 8161701, 10802625, 13602835, 18004375, 80187723, 133646205

Offset

1,1

Comments

Possible prime divisors are listed in A366823.

Different terms may correspond to the same prime. For example, both a(1) and a(2) produce prime A366823(1) = 521881.

Links

Table of n, a(n) for n=1..10.

Crossrefs

Cf. A366823.

Sequence in context: A234489 A321160 A223369 * A254509 A254516 A254816

Adjacent sequences: A366821 A366822 A366823 * A366825 A366826 A366827

Keyword

nonn,hard,more

Author

Rustem Aidagulov and Max Alekseyev, Oct 24 2023

Status

approved