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

Author

Jean-François Alcover, Apr 25 2014

Keywords

• nonn
• cons

Comments

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

Examples

			0.6304735033743867961220401927108789...
		

Links

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

Crossrefs

Cf. A073004, A080130.

Programs

Mathematica

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

Formula

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

Equals 2*A080130^2.