A229759 Decimal expansion of (25-10*sqrt(5))/2.

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

Offset

1,2

Comments

Essentially the same as A225667 and A132338. - R. J. Mathar, Sep 30 2013

Links

Ivan Panchenko, Table of n, a(n) for n = 1..1000

Index entries for algebraic numbers, degree 2.

Formula

Equals 25/2 - 5*sqrt(5).

Minimal polynomial: 4*x^2 - 100*x + 125. - Amiram Eldar, Mar 26 2026

Example

1.31966011250105151795413165634361882279690820194237...

Mathematica

RealDigits[(25-10*Sqrt[5])/2, 10, 120][[1]] (* Amiram Eldar, Mar 26 2026 *)

Prog

(PARI) (25-10*sqrt(5))/2 \\ Charles R Greathouse IV, May 18 2026

Crossrefs

Cf. A094874, A132338, A187426, A187798, A187799, A225667.

Sequence in context: A242402 A217629 A127552 * A185580 A052931 A368379

Adjacent sequences: A229756 A229757 A229758 * A229760 A229761 A229762

Keyword

cons,nonn

Author

Joost Gielen, Sep 28 2013

Status

approved