OFFSET
1,2
COMMENTS
Conjecture: all terms greater than 1 are irregular primes (A000928) or a product of irregular primes.
MATHEMATICA
a = Numerator@ BernoulliB@ 2; b = Numerator@ BernoulliB@ 4; k = 6; lst = {}; While[k < 75001, a = b; b = Numerator@ BernoulliB@ k; g = GCD[a, b]; If[ !MemberQ[ lst, g], AppendTo[lst, g]]; k += 2]; lst
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Robert G. Wilson v, Apr 30 2021
STATUS
approved