Arima Yoriyuki

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Arima Yoriyuki (Japanese: 有馬 頼徸; December 31, 1714 – December 16, 1783) was a Japanese mathematician of the Edo era. He was the lord of Kurume Domain and approximated the value of π and its square, π². In 1766, he found the following rational approximation of pi, correct to 29 digits: ^{[1] [2]}

[edit] References

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