OFFSET
0,1
COMMENTS
See A091343.
LINKS
Stanislav Sykora, Table of n, a(n) for n = 0..2000
Wikipedia, Dedekind eta function.
FORMULA
eta(4*i) = c*eta(i) = c*Gamma(1/4)/(2*Pi^(3/4)) = c*A091343, with c = 2^(-13/16)*(sqrt(2)-1)^(1/4).
EXAMPLE
0.35091980717414323643022958905627638093114604398534590...
MATHEMATICA
RealDigits[N[(Sqrt[2]-1)^(1/4)*Gamma[1/4]/(2^(29/16)*Pi^(3/4)), 120]][[1]] (* Vaclav Kotesovec, Oct 04 2014 *)
PROG
(PARI) eta(4*I, 1)
CROSSREFS
KEYWORD
AUTHOR
Stanislav Sykora, Oct 04 2014
STATUS
approved