Arima Yoriyuki (31 December 1714 to 16 December 1783), written 有馬 頼徸 in Japanese, was a Japanese mathematician of the Edo period and the lord of Kurume Domain. He approximated the value of pi and of its square. In 1766 he found a rational approximation of pi that is correct to twenty nine digits, stated as a ratio of two large integers whose decimal value begins 3.14159265358979323846264338327. He was born on the last day of 1714 and died in December 1783, at the age of sixty eight.
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