A366823 Primes p that divide gcd(2^k + 1, k! - 1) for some k other than (p-1)/2.

521881, 774593, 4327489, 21764537, 28807001, 213833929

Offset: 1

Author

Rustem Aidagulov and Max Alekseyev, Oct 24 2023

Keywords

• nonn
• more
• hard

Comments

Prime p divides gcd(2^k + 1, k! - 1) for k = (p-1)/2 iff p belongs to A058302 and p == 3 (mod 8).

Crossrefs

Cf. A058302, A366824 (possible values of k).