A229728 Decimal expansion of the square of the constant A130834.

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

Offset

1,1

References

Steven R. Finch, Mathematical Constants, Cambridge, 2003, p. 232.

Links

Table of n, a(n) for n=1..120.

Formula

From Amiram Eldar, Jun 12 2023: (Start)

Equals exp(4*G/Pi) = exp(4*A006752/A000796).

Equals A097469^4. (End)

Example

3.209912300728157678629749481779905158748592124251834494874586...

Mathematica

RealDigits[Exp[4*Catalan/Pi], 10, 120][[1]] (* Amiram Eldar, Jun 12 2023 *)

Prog

(PARI) exp(4*Catalan/Pi) \\ Charles R Greathouse IV, Jul 15 2014

Crossrefs

Cf. A000796, A006752, A097469, A130834.

Sequence in context: A335998 A152441 A248181 * A077907 A355360 A067346

Adjacent sequences: A229725 A229726 A229727 * A229729 A229730 A229731

Keyword

nonn,cons

Author

N. J. A. Sloane, Oct 01 2013

Status

approved