Algorithmic Determination of a Large Integer in the Two-Term Machin-like Formula for π

Autor: Sanjar M. Abrarov, Rajinder K. Jagpal, Rehan Siddiqui, Brendan M. Quine
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: Mathematics, Vol 9, Iss 17, p 2162 (2021)
Druh dokumentu: article
ISSN: 2227-7390
DOI: 10.3390/math9172162
Popis: In our earlier publication we have shown how to compute by iteration a rational number u2,k in the two-term Machin-like formula for π of the kind π4=2k−1arctan1u1,k+arctan1u2,k,k∈Z,k≥1, where u1,k can be chosen as an integer u1,k=ak/2−ak−1 with nested radicals defined as ak=2+ak−1 and a0=0. In this work, we report an alternative method for determination of the integer u1,k. This approach is based on a simple iteration and does not require any irrational (surd) numbers from the set ak in computation of the integer u1,k. Mathematica programs validating these results are presented.
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