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A188638 Decimal expansion of length/width of a meta-1st electrum rectangle. 2
1, 8, 9, 4, 0, 0, 6, 6, 5, 3, 5, 4, 7, 6, 8, 0, 5, 9, 0, 9, 4, 2, 4, 3, 8, 0, 7, 8, 8, 8, 2, 0, 5, 6, 3, 7, 8, 1, 9, 0, 4, 9, 6, 4, 5, 8, 8, 3, 9, 4, 2, 7, 3, 9, 2, 2, 1, 6, 6, 4, 2, 2, 4, 1, 9, 3, 4, 5, 2, 8, 7, 0, 8, 7, 1, 5, 9, 9, 8, 7, 0, 4, 4, 8, 1, 9, 9, 1, 1, 9, 9, 9, 9, 8, 6, 0, 3, 0, 2, 2, 8, 9, 4, 7, 8, 0, 6, 6, 4, 1, 8, 6, 7, 6, 6, 7, 1, 8, 6, 4, 5, 1, 1, 1, 2, 9, 3, 7, 6, 2 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

See A188618 for the definition of 1st electrum rectangle.  Briefly, it is a rectangle such that the removal of a golden rectangle from one end leaves a silver rectangle.

LINKS

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

Clark Kimberling, A Visual Euclidean Algorithm, The Mathematics Teacher 76 (1983) 108-109.

MATHEMATICA

t=(1+3^(1/2))/2; r=(t+(t^2+4)^(1/2))/2

FullSimplify[r]

N[r, 130]

RealDigits[N[r, 130]][[1]]

CROSSREFS

Cf. A188618, A188619, A188639.

Sequence in context: A197826 A197755 A021532 * A244664 A010532 A317864

Adjacent sequences:  A188635 A188636 A188637 * A188639 A188640 A188641

KEYWORD

nonn,cons

AUTHOR

Clark Kimberling, Apr 06 2011

STATUS

approved

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Last modified March 3 10:38 EST 2021. Contains 341762 sequences. (Running on oeis4.)