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A188659 Decimal expansion of (1+sqrt(26))/5. 3
1, 2, 1, 9, 8, 0, 3, 9, 0, 2, 7, 1, 8, 5, 5, 6, 9, 6, 6, 0, 0, 5, 6, 4, 4, 8, 2, 1, 8, 0, 4, 5, 5, 6, 3, 9, 7, 9, 1, 2, 7, 5, 4, 1, 8, 9, 2, 1, 9, 9, 1, 9, 2, 8, 1, 5, 1, 6, 9, 9, 4, 1, 6, 0, 8, 8, 5, 1, 8, 6, 7, 2, 6, 4, 1, 2, 4, 4, 4, 8, 3, 9, 1, 1, 7, 6, 6, 9, 7, 7, 0, 2, 1, 8, 7, 8, 6, 4, 0, 1, 6, 7, 2, 2, 3, 8, 0, 5, 1, 6, 4, 8, 2, 0, 7, 9, 8, 2, 1, 3, 2, 2, 8, 6, 3, 5, 5, 8, 6, 8 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Decimal expansion of the shape of a (2/5)-extension rectangle; see A188640 for definitions of shape and r-extension rectangle.  Briefly, shape=length/width, and an r-extension rectangle is composed of two rectangles of shape 1/r when r<1.

The continued fraction of the constant is 1, 4, 1, 1, 4, 1, 1, 4, 1, 1, 4, 1, 1, 4, 1, 1, 4, 1, 1, 4...

LINKS

Table of n, a(n) for n=1..130.

EXAMPLE

1.219803902718556966005644821804556397912754189219919281516994...

MATHEMATICA

RealDigits[(1 + Sqrt[26])/5, 10, 111][[1]] (* Robert G. Wilson v, Aug 18 2011 *)

CROSSREFS

Cf. A188640, A188658, A188729, A188730, A010481.

Sequence in context: A021459 A133169 A133175 * A042977 A198106 A243261

Adjacent sequences:  A188656 A188657 A188658 * A188660 A188661 A188662

KEYWORD

nonn,cons

AUTHOR

Clark Kimberling, Apr 09 2011

STATUS

approved

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Last modified February 24 12:52 EST 2021. Contains 341569 sequences. (Running on oeis4.)