A366823 - OEIS

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

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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

CROSSREFS

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

KEYWORD

nonn,more,hard

AUTHOR

Rustem Aidagulov and Max Alekseyev, Oct 24 2023

STATUS

approved