This is the title page of Seki Kowa’s (1642-1708) *Katsuyo sampo* [*Essentials of Mathematics,* 4 vols.], published posthumously in 1712. It is a collection of Seki’s discoveries including:

- an accurate value of \(\pi\) to 10 decimal places and the computation of the volume of a sphere using
*enri,*which was a “method of circles”; - “Newton’s” interpolation formula;
- properties of spirals and ellipses;
- derivation of “Bernoulli” numbers; and
- the “Pappus-Guldin” theorem.

These are two pages in Volume I showing the table employed to obtain “Bernoulli” numbers. They are given in the right column and were obtained by a technique called *Ruisai Shosa-ho*.