OFFSET
0,10
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..5000
D. Ford, J. McKay and S. P. Norton, More on replicable functions, Comm. Algebra 22, No. 13, 5175-5193 (1994).
FORMULA
Expansion of sqrt(T27d) in powers of q, where T27d = A058604. - G. C. Greubel, Jul 01 2018
EXAMPLE
T54d = 1/q + q^5 - q^11 + q^17 + q^35 + q^41 + 2*q^53 + q^59 - q^65 + ...
MATHEMATICA
eta[q_] := q^(1/24)*QPochhammer[q]; nmax := 100; A:= q*(eta[q^3]/ eta[q^9])^4; T9b := (A + 9*q^2/A); T27d := (6*q + T9b + O[q]^nmax)^(1/3); a:= CoefficientList[Series[(T27d + O[q]^nmax)^(1/2), {q, 0, 60}], q]; Table[a[[n]], {n, 1, 50}] (* G. C. Greubel, Jul 01 2018 *)
PROG
(PARI) q='q+O('q^80); A = (eta(q^3)/eta(q^9))^4; T9b = A + 9*q^2/A; T27d = (6*q + T9b)^(1/3); Vec(sqrt(T27d)) \\ G. C. Greubel, Jul 01 2018
CROSSREFS
KEYWORD
sign
AUTHOR
Michael Somos, Aug 28 2005
STATUS
approved