cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A244858 Decimal expansion of the integral of log(x^2+y^2)/((1+x^2)*(1+y^2)) dx dy over the square [0,1]x[0,1] (negated).

Original entry on oeis.org

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

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Author

Jean-François Alcover, Jul 07 2014

Keywords

Comments

This integral is mentioned by Bailey & Borwein as the only non-challenging one in the family J(t) = integral of log(t+x^2+y^2)/((1+x^2)*(1+y^2)) dx dy over the square [0,1]x[0,1], with t>=0.

Examples

			-0.6242317612735752156718034442003877374631268152861919268604793703917886...
		

Crossrefs

Cf. A244843.

Programs

  • Mathematica
    Pi^2/16*Log[2] - 7/8*Zeta[3] // RealDigits[#, 10, 105]& // First

Formula

Pi^2/16*log(2) - 7/8*zeta(3).
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