>>421-423
>ベルヌーイ数の記述どこよ。

ベルヌーイ数
関孝和も研究したのか（下記）
元々は、べき乗和の計算のためだったんだ
古代ギリシャ、Pythagoras、Archimedes も登場するんだね、へー
知らなかったね

（参考）
https://en.wikipedia.org/wiki/Bernoulli_number
Bernoulli number

Contents
1 Notation
2 History
2.1 Early history
2.2 Reconstruction of "Summae Potestatum"

Early history
The Bernoulli numbers are rooted in the early history of the computation of sums of integer powers, which have been of interest to mathematicians since antiquity.
Among the great mathematicians of antiquity to consider this problem were Pythagoras (c. 572–497 BCE, Greece), Archimedes (287–212 BCE, Italy), Aryabhata (b. 476, India),

https://upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Seki_Kowa_Katsuyo_Sampo_Bernoulli_numbers.png/330px-Seki_Kowa_Katsuyo_Sampo_Bernoulli_numbers.png
A page from Seki Takakazu's Katsuyō Sanpō (1712), tabulating binomial coefficients and Bernoulli numbers