A366823 - OEIS

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A366823

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

%I #8 Dec 05 2023 08:53:12

%S 521881,774593,4327489,21764537,28807001,213833929

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

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

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

%K nonn,more,hard

%O 1,1

%A Rustem Aidagulov and _Max Alekseyev_, Oct 24 2023