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

Author

Rustem Aidagulov and Max Alekseyev, Oct 24 2023

Keywords

• nonn
• hard
• more

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.

Crossrefs

Cf. A366823.