>>421
>ベルヌーイ数の記述どこよ。

The J-homomorphism のとこ
”a cyclic group of order equal to the denominator of ​B2m/4m,
 where B2m is a Bernoulli number, if k = 4m - 1 ≡ 3 (mod 4).”

J-homomorphism
https://en.wikipedia.org/wiki/J-homomorphism