A176518 Decimal expansion of 3*(15+7*sqrt(5))/10.

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

Offset

1,1

Comments

Continued fraction expansion of (45+21*sqrt(5))/10 is A010720 preceded by 9.

Quadratic number with denominator 5 and minimal polynomial 5x^2 - 45x - 9. - Charles R Greathouse IV, Apr 25 2016

Links

Table of n, a(n) for n=1..105.

Example

(45+21*sqrt(5))/10 = 9.19574275274955836245...

Mathematica

RealDigits[(45+21*Sqrt[5])/10, 10, 120][[1]] (* Harvey P. Dale, Aug 24 2012 *)

Prog

(PARI) (21*sqrt(5)+45)/10 \\ Charles R Greathouse IV, Apr 25 2016

Crossrefs

Cf. A002163 (decimal expansion of sqrt(5)), A010720(repeat 5, 9).

Sequence in context: A021525 A297013 A197724 * A154697 A187368 A193670

Adjacent sequences: A176515 A176516 A176517 * A176519 A176520 A176521

Keyword

cons,nonn

Author

Klaus Brockhaus, Apr 23 2010

Status

approved