A241532 Decimal expansion of 2*e^(-2*gamma), gamma being the Euler constant.

6, 3, 0, 4, 7, 3, 5, 0, 3, 3, 7, 4, 3, 8, 6, 7, 9, 6, 1, 2, 2, 0, 4, 0, 1, 9, 2, 7, 1, 0, 8, 7, 8, 9, 0, 4, 3, 5, 4, 5, 8, 7, 0, 7, 8, 7, 1, 2, 7, 3, 2, 3, 4, 1, 5, 7, 3, 8, 1, 7, 9, 8, 3, 7, 0, 8, 9, 7, 0, 0, 0, 3, 8, 2, 9, 9, 5, 8, 1, 9, 1, 1, 0, 1, 8, 9, 9, 5, 4, 1, 6, 5, 7, 8, 1, 7, 1, 9, 0, 9

Offset

0,1

Comments

See Table 1, last row, first column, of the Bailey, Borwein and Crandall link. - Wolfdieter Lang, Apr 25 2014

Links

Table of n, a(n) for n=0..99.

D.H. Bailey, J.M. Borwein, R.E. Crandall, Integrals of the Ising class

Formula

Limit_{n -> infinity} (2^n/n!)*integral_{0..infinity} p*BesselK(0,p)^n dp. - after Bailey & Borwein.

Equals 2*A080130^2.

Example

0.6304735033743867961220401927108789...

Mathematica

RealDigits[2*E^(-2*EulerGamma), 10, 100] // First

Crossrefs

Cf. A073004, A080130.

Sequence in context: A184082 A198868 A249733 * A196830 A206530 A333549

Adjacent sequences: A241529 A241530 A241531 * A241533 A241534 A241535

Keyword

nonn,cons

Author

Jean-François Alcover, Apr 25 2014

Status

approved