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

Author

N. J. A. Sloane, Oct 01 2013

Keywords

• nonn
• cons

Examples

			3.209912300728157678629749481779905158748592124251834494874586...
		

References

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

Crossrefs

Cf. A000796, A006752, A097469, A130834.

Cf. A007341, A212800, A334088, A335586, A340139, A340176, A340557, A340562, A341479.

Programs

Mathematica

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

PARI

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

Formula

From Amiram Eldar, Jun 12 2023: (Start)

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

Equals A097469^4. (End)