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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
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
Sequence in context: A197755 A360148 A021532 * A244664 A010532 A317864
KEYWORD
nonn,cons
AUTHOR
Clark Kimberling, Apr 06 2011
STATUS
approved

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Last modified March 28 16:58 EDT 2024. Contains 371254 sequences. (Running on oeis4.)