OFFSET
1,2
COMMENTS
This constant is the sum of reciprocals of Cullen numbers.
FORMULA
Equals Sum_{n>=0} 1/A002064(n).
EXAMPLE
1.5106374481309548528461974960802456940320940529869241186970756482342266...
MATHEMATICA
First[RealDigits[NSum[1/(n*2^n+1), {n, 0, Infinity}, NSumTerms -> 100, Method -> {"NIntegrate", "MaxRecursion" -> 10}, WorkingPrecision -> 100]]] (* Stefano Spezia, Jan 24 2021 *)
PROG
(PARI) suminf(n=0, 1/(n*2^n + 1)) \\ Michel Marcus, Jan 24 2021
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Marco Ripà, Jan 23 2021
STATUS
approved