OFFSET
0,1
COMMENTS
Chen and Ruzsa (1999) proved that this constant is irrational.
LINKS
Yong-Gao Chen and Imre Z. Ruzsa, On the irrationality of certain series, Periodica Mathematica Hungarica, Vol. 38, No. 1 (1999), pp. 31-37.
EXAMPLE
0.79907321982327239944106432321005064531722246539852...
MATHEMATICA
RealDigits[Sum[n/2^n, {n, Select[Range[1000], # == 1 || Min[FactorInteger[#][[;; , 2]]] > 1 &]}], 10, 120][[1]]
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Amiram Eldar, Mar 12 2024
STATUS
approved