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

1,1

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).

Links

Table of n, a(n) for n=1..6.

Crossrefs

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

Sequence in context: A251043 A364263 A250705 * A237217 A237248 A013695

Adjacent sequences: A366820 A366821 A366822 * A366824 A366825 A366826

Keyword

nonn,more,hard

Author

Rustem Aidagulov and Max Alekseyev, Oct 24 2023

Status

approved