A202142 Decimal expansion of 4/sqrt((1+sqrt(5))/2).

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

Offset

1,1

Links

Table of n, a(n) for n=1..99.

David Richeson, A pyramidologist's value for pi (2011).

Formula

Equals 4/sqrt(phi).

Example

3.1446055110296931442782343433718357180924882313508929506596...

Mathematica

RealDigits[4/Sqrt[GoldenRatio], 10, 120][[1]] (* Amiram Eldar, Jun 11 2023 *)

Prog

(PARI) sqrt(8*sqrt(5)-8) \\ Charles R Greathouse IV, Aug 18 2014

Crossrefs

Cf. A001622, A202108.

Sequence in context: A014388 A186693 A117374 * A021322 A277129 A036412

Adjacent sequences: A202139 A202140 A202141 * A202143 A202144 A202145

Keyword

nonn,cons

Author

N. J. A. Sloane, Dec 12 2011

Status

approved