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.

A231863 Decimal expansion of 1/sqrt(2*Pi).

Original entry on oeis.org

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

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Author

Stanislav Sykora, Nov 14 2013

Keywords

Comments

Maximum of the probability density for standard error distribution (i.e., normal distribution density with unit variance).

Examples

			0.39894228040143267793994605993438186847585863116493465766592582967...
		

Crossrefs

Cf. A019727 (inverse), A000796 (Pi).

Programs

  • Magma
    R:= RealField(); 1/Sqrt(2*Pi(R)); // G. C. Greubel, Jul 27 2018
  • Mathematica
    RealDigits[1/Sqrt[2*Pi], 10, 100][[1]] (* G. C. Greubel, Jul 27 2018 *)
  • PARI
    1/sqrt(2*Pi) \\ G. C. Greubel, Jul 27 2018
    

Formula

Equals Integral_{x=-oo..oo} sin(Pi^2*x^2 + 1/x^2) dx (Zarnowski and Diminnie, 1999). - Amiram Eldar, May 21 2022