A189969 Decimal expansion of (7 + sqrt(133))/6.

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

Offset

1,1

Comments

Has periodic continued fractions [3,11,3,1,3,11,3,1,...] and [7/3, 1, 7/3, 1, ...].

Let R denote a rectangle whose shape (i.e., length/width) is (7+sqrt(133))/6. This rectangle can be partitioned into squares in a manner that matches the continued fraction [3,11,3,1,3,11,3,1,...]. It can also be partitioned into rectangles of shape 3/2 and 3 so as to match the continued fraction [7/3, 1, 7/3, 1, ...]. For details, see A188635.

Links

G. C. Greubel, Table of n, a(n) for n = 1..10000

Index entries for algebraic numbers, degree 2.

Formula

Minimal polynomial: 3*x^2 - 7*x - 7. - Amiram Eldar, Jun 08 2026

Example

3.08876043244513264822569720646964541676384480854023113888797967935587857357....

Mathematica

FromContinuedFraction[{7/3, 1, {7/3, 1}}]
RealDigits[N[%, 120]]

Prog

(PARI) (7 + sqrt(133))/6 \\ G. C. Greubel, Jan 12 2018
(Magma) (7 + Sqrt(133))/6; // G. C. Greubel, Jan 12 2018

Crossrefs

Cf. A188635, A188967.

Sequence in context: A068458 A238258 A011082 * A021768 A155876 A181977

Adjacent sequences: A189966 A189967 A189968 * A189970 A189971 A189972

Keyword

nonn,cons

Author

Clark Kimberling, May 05 2011

Extensions

Typo in name corrected by G. C. Greubel, Jan 12 2018

Status

approved