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A274346 Denominators of coefficients in the expansion of (log(q) - log(k^2/16))/(8*k^2/16) in powers of k^2/16, where q is the Jacobi nome and k^2 the parameter of elliptic functions. 3
1, 2, 3, 4, 5, 3, 7, 8, 9, 5, 11, 3, 13, 7, 15, 16, 17, 9, 19, 5, 21, 11, 23, 3, 25, 1, 27, 7, 29, 3, 31, 32, 33, 17, 35, 9, 37, 19, 39, 5, 41, 21, 43, 11, 9, 23, 47, 6, 49, 25, 51, 13, 53, 27, 55, 7, 57, 29, 59, 15, 61, 31, 63, 64, 1, 33, 67, 17, 3, 35, 71, 9, 73, 37, 75, 19, 11, 39, 79, 10 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

The numerators are given in A274345, where also details and the first rationals are given.

The Mathematica program below gives the rationals r(n-1), n = 1..50.

LINKS

Table of n, a(n) for n=0..79.

FORMULA

a(n) = denominator(A227503(n+1)/(n+1)),  n >= 0.

(log(q) - log(k^2/16))/(8*k^2/16) = Sum_{n >= 0} (A274345(n)/a(n))*(k^2/16)^n.

MATHEMATICA

Table[SeriesCoefficient[Log[EllipticNomeQ[16 x]/x]/8, {x, 0, n}], {n, 1, 50}] // Denominator (* Vaclav Kotesovec, Jun 30 2016 *)

CROSSREFS

Cf. A227503, A274345.

Sequence in context: A053585 A305007 A098988 * A034699 A217434 A322035

Adjacent sequences:  A274343 A274344 A274345 * A274347 A274348 A274349

KEYWORD

nonn,easy,frac

AUTHOR

Wolfdieter Lang, Jun 30 2016

EXTENSIONS

More terms from Vaclav Kotesovec, Jun 30 2016

STATUS

approved

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Last modified December 13 20:06 EST 2018. Contains 318087 sequences. (Running on oeis4.)