Arima Yoriyuki

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Arima Yoriyuki

Arima Yoriyuki (有馬 頼徸, December 31, 1714 – December 16, 1783) was a Japanese mathematician of the Edo period. He was the lord of Kurume Domain.

He approximated the value of and its square, . In 1766, he found the following rational approximation of pi, correct to 29 digits:[1][2]


  1. ^ "Collection of approximations for ". Retrieved April 4, 2008.
  2. ^ Hardy, G. H.; E. M. Wright (1978). An Introduction to the Theory of Numbers. Oxford Science Publications.