A190357 Decimal expansion of 1/4 - 2/Pi^2.

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

Offset: 0

Author

Jonathan Vos Post, May 09 2011

Keywords

• nonn
• easy
• cons

Comments

Constant given on p. 1 of Schlage-Puchta.

Examples

			0.047357632715324457112241...
		

Links

• G. C. Greubel, Table of n, a(n) for n = 0..10000
• Jan-Christoph Schlage-Puchta, Sumsets avoiding squarefree integers, arXiv:1105.1305 [math.NT], May 06 2011.
• Index entries for transcendental numbers

Crossrefs

Cf. A005117, A010716 (1/18), A059956 (6/Pi^2).

Programs

Magma

R:=RealField(100); [(1/4) - (2/Pi(R)^2)]; // G. C. Greubel, Apr 05 2018

Mathematica

Join[{0}, RealDigits[(1/4) - (2/Pi^2), 10, 100][[1]]] (* G. C. Greubel, Apr 05 2018 *)

PARI

(1/4) - (2/Pi^2) \\ G. C. Greubel, Apr 05 2018

Formula

Equals (1/4) - (2/Pi^2).