The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A215472 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A215472

Expansion of (psi(x) * phi(-x)^4)^2 in powers of x where phi(), psi() are Ramanujan theta functions.
(history; published version)

#19 by Charles R Greathouse IV at Sun Feb 16 08:33:18 EST 2025

LINKS

Eric Weisstein's World of Mathematics, <a href="httphttps://mathworld.wolfram.com/RamanujanThetaFunctions.html">Ramanujan Theta Functions</a>

Discussion

Sun Feb 16

08:33

OEIS Server: https://oeis.org/edit/global/3014

#18 by Charles R Greathouse IV at Fri Mar 12 22:24:46 EST 2021

LINKS

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

Discussion

Fri Mar 12

22:24

OEIS Server: https://oeis.org/edit/global/2897

#17 by N. J. A. Sloane at Wed Nov 13 21:54:14 EST 2019

LINKS

M. Somos, <a href="http://cis.csuohio.edu/~somosA010815/multiqa010815.pdftxt">Introduction to Ramanujan theta functions</a>

Discussion

Wed Nov 13

21:54

OEIS Server: https://oeis.org/edit/global/2830

#16 by Joerg Arndt at Mon Oct 02 02:24:04 EDT 2017

STATUS

proposed

approved

#15 by Jon E. Schoenfield at Mon Oct 02 02:02:09 EDT 2017

STATUS

editing

proposed

#14 by Jon E. Schoenfield at Mon Oct 02 02:02:05 EDT 2017

FORMULA

G.f. is a period 1 Fourier series which satisfies f(-1 / (8 t)) = 128 (t/i)^5 g(t) where q = exp(2 pi Pi i t) and g() is the g.f. for A030212.

STATUS

reviewed

editing

#13 by Michel Marcus at Mon Oct 02 02:00:45 EDT 2017

STATUS

proposed

reviewed

#12 by G. C. Greubel at Sun Oct 01 23:11:05 EDT 2017

STATUS

editing

proposed

#11 by G. C. Greubel at Sun Oct 01 23:10:53 EDT 2017

LINKS

G. C. Greubel, <a href="/A215472/b215472.txt">Table of n, a(n) for n = 0..1000</a>

STATUS

approved

editing

#10 by Joerg Arndt at Thu Sep 05 09:38:27 EDT 2013

STATUS

proposed

approved