A225357 Decimal expansion of (4/7)*(43/57)^(4/3).

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

Offset

0,1

Comments

Steven Weinberg suggested that the contribution from Goldstone bosons to the effective number of neutrino species present in the era before recombination would be (4/7)*(43/57)^(4/3).

Links

Table of n, a(n) for n=0..104.

Steven Weinberg, Goldstone bosons as fractional cosmic neutrinos, arXiv:1305.1971 [astro-ph.CO], 2013.

Formula

Equals decimal expansion of 172*(43/57)^(1/3)/399.

Example

0.3924220641608327323408794203612644413782408855111339...

Mathematica

RealDigits[(4/7)*(43/57)^(4/3), 10, 110][[1]] (* T. D. Noe, Jun 03 2013 *)

Prog

(SageMath) numerical_approx((4/7)*(43/57)^(4/3), digits=115) # G. C. Greubel, Mar 19 2022

Crossrefs

Cf. A111728, A225359.

Sequence in context: A194807 A114875 A275371 * A201664 A103824 A155080

Adjacent sequences: A225354 A225355 A225356 * A225358 A225359 A225360

Keyword

nonn,cons

Author

Omar E. Pol, May 28 2013

Status

approved