Arima Yoriyuki

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In this Japanese name, the family name is Arima.

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



  1. ^ "Collection of approximations for \pi". Retrieved 2008-04-04. 
  2. ^ Hardy, G. H.; E. M. Wright (1978). An Introduction to the Theory of Numbers. Oxford Science Publications.