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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A375506 Decimal expansion of the first derivative of the Dirichlet eta-function eta(s) at s=3/2.

Original entry on oeis.org

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

Views

Author

R. J. Mathar, Aug 18 2024

Keywords

Examples

			0.12867475083035719009595292991030137571142185354249...
		

Crossrefs

Cf. A091812 (at s=1), A210593 (at s=2), A349220 (at s=3), A078434 (zeta(3/2)), A375503 (zeta'(3/2)).

Programs

  • Maple
    s :=3/2 ; 2^(1-s)*log(2)*Zeta(s)+(1-2^(1-s))*Zeta(1,s) ; evalf(%) ;
  • Mathematica
    RealDigits[DirichletEta'[3/2], 10, 120][[1]] (* Amiram Eldar, Aug 19 2024 *)

Formula

Equals log(2)*zeta(3/2)/sqrt(2) +(1-1/sqrt(2))*zeta'(3/2) = Sum_{i>=1} (-1)^i*log(i)/i^(3/2).
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