0,1

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

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).

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

Steven Weinberg, Goldstone bosons as fractional cosmic neutrinos

0.3924220641608327323408794203612644413782408855111339...

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

Cf. A111728, A225359.

Sequence in context: A194807 A114875 A275371 * A201664 A103824 A155080

Adjacent sequences: A225354 A225355 A225356 * A225358 A225359 A225360

nonn,cons

Omar E. Pol, May 28 2013

approved