A377400 Decimal expansion of e*(gamma - Ei(-1))/2.

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

Offset

1,3

Links

Table of n, a(n) for n=1..100.

Michael I. Shamos, A catalog of the real numbers, (2007). See p. 120.

Formula

Equals Sum_{n>=1} (1/n!)*Sum_{k=1..n} 1/(2*k) (see Shamos).

Equals A347952 / 2.

Example

1.08269110766346817971049317424621528419071038...

Mathematica

RealDigits[E(EulerGamma-ExpIntegralEi[-1])/2, 10, 100][[1]]

Crossrefs

Cf. A000142, A001008, A001113, A001620, A005843, A060746, A099285, A347952, A377401.

Sequence in context: A120219 A367899 A240976 * A199158 A086089 A091350

Adjacent sequences: A377397 A377398 A377399 * A377401 A377402 A377403

Keyword

nonn,cons

Author

Stefano Spezia, Oct 27 2024

Status

approved