OFFSET
0,1
FORMULA
Equals Sum_{k>=0} tan(k*Pi/3)/2^k.
EXAMPLE
0.494871659305393512436413240430249247697944358...
MATHEMATICA
s = Sum[Tan[k Pi/3]/2^k, {k, 0, Infinity}]
d = N[s, 100]
First[RealDigits[d]]
N[(2 Sqrt[3])/7, 100]
PROG
(Python)
from math import isqrt
def A372912(n): return isqrt(12*10**(n+1<<1)//49)%10 # Chai Wah Wu, Jul 08 2024
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Clark Kimberling, Jul 01 2024
STATUS
approved