The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A131126 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A131126

Expansion of (phi(q^2) / phi(-q))^2 in powers of q where phi() is a Ramanujan theta function.
(history; published version)

#29 by Susanna Cuyler at Fri Mar 12 04:04:41 EST 2021

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reviewed

approved

#28 by Michel Marcus at Fri Mar 12 01:49:42 EST 2021

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proposed

reviewed

#27 by Michel Marcus at Fri Mar 12 01:49:38 EST 2021

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editing

proposed

#26 by Michel Marcus at Fri Mar 12 01:49:35 EST 2021

LINKS

M. Michael Somos, <a href="/A010815/a010815.txt">Introduction to Ramanujan theta functions</a>

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reviewed

editing

#25 by Joerg Arndt at Fri Mar 12 01:18:30 EST 2021

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proposed

reviewed

#24 by Jon E. Schoenfield at Thu Mar 11 23:33:47 EST 2021

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editing

proposed

#23 by Jon E. Schoenfield at Thu Mar 11 23:33:45 EST 2021

FORMULA

Empirical: Sum_{n>=0} a(n)/exp(2*Pi*n) = 1/2 + (1/8)*sqrt(8 + 6*sqrt(2)). - Simon Plouffe, Mar 04 2021

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approved

editing

#22 by N. J. A. Sloane at Thu Mar 11 20:40:47 EST 2021

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proposed

approved

#21 by Simon Plouffe at Thu Mar 11 19:57:35 EST 2021

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editing

proposed

#20 by Simon Plouffe at Thu Mar 11 19:57:30 EST 2021

FORMULA

Empirical: Sum_{n>=10} a(n)/exp(2*Pi*(n-1)) = 1/2 + 1/8*sqrt(8+6*sqrt(2)). - Simon Plouffe, Mar 04 2021

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proposed

editing