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An iteration procedure for a two-term Machin-like formula for pi with small Lehmer's measure by Abrarov, S. M.; Quine, B. M. is a scholarly article available to read on EtoBox.

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In this paper we present a two-term Machin-like formula for pi \[\frac{\pi}{4} = 2^{k - 1}\arctan\left(\frac{1}{u_1}\right) + \arctan\left(\frac{1}{u_2}\right)\] with small Lehmer's measure $e \approx 0.245319$ and describe iteration procedure for simplified determination of the required rational number $u_2$ at $k = 27$ and $u_1 = 85445659$. With these results we obtained a formula that has no irrational numbers involved in computation and provides $16$ digits of pi at each increment by one of the summation terms. This is the smallest Lehmer's measure ever reported for the Machin-like formulas for pi.

Author

Abrarov, S. M.; Quine, B. M.

Published

2017

Language

EN