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A054388

Denominators of coefficients of 1/2^(2n+1) in Newton's series for Pi.

1, 3, 5, 28, 72, 704, 1664, 2560, 17408, 311296, 688128, 3014656, 6553600, 56623104, 121634816, 520093696, 369098752, 7516192768, 79456894976, 111669149696, 704374636544, 5909874999296, 824633720832, 51677046505472

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OFFSET

0,2

LINKS

Table of n, a(n) for n=0..23.

Eric Weisstein's World of Mathematics, Pi Formulas.

FORMULA

Pi = 3*sqrt(3)/4 + 24*(1/12 - sum(n >= 2, (2*n-2)!/((n-1)!^2*(2*n-3)*(2*n+1)*2^(4*n-2)))) (Newton)

CROSSREFS

Cf. A054387, A000796.

Sequence in context: A163783 A103526 A393294 * A110255 A290330 A300676

Adjacent sequences: A054385 A054386 A054387 * A054389 A054390 A054391

KEYWORD

nonn

AUTHOR

Eric W. Weisstein

STATUS

approved

URL: https://oeis.org/A054388

⇱ A054388 - OEIS