OFFSET
1,2
COMMENTS
FORMULA
Equals 1 + A190405 (as a decimal number).
Equals Product{k>=1} (1 - 1/2^(2*k))/(1 - 1/2^(2*k-1)). - Amiram Eldar, Aug 13 2020
EXAMPLE
1.641632560655153866293842770225429434226061537956739747804651622380144603733...
MATHEMATICA
RealDigits[QPochhammer[1/4, 1/4]/QPochhammer[2, 1/4], 10, 100][[1]] (* Amiram Eldar, Aug 13 2020 *)
PROG
(PARI) default(realprecision, 200); suminf(k=0, 2^(-k*(k+1)/2))
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
M. F. Hasler, Feb 27 2018
STATUS
approved