OFFSET
1,2
COMMENTS
Decimal expansion of the shape (= length/width = (7+sqrt(13))/6) of the greater (7/3)-contraction rectangle.
See A188738 for an introduction to lesser and greater r-contraction rectangles, their shapes, and partitioning these rectangles into a sets of squares in a manner that matches the continued fractions of their shapes.
From Wolfdieter Lang, Aug 29 2022: (Start)
This constant t is an element of the quadratic number field Q(sqrt(13)) with (monic) polynomial x^2 - (7/3)*x + 1, and the negative root is -A188942.
The constant t - 1 = (1 + sqrt(13))/6 = A209927/3 has minimal polynomial x^2 - x/3 - 1/3, with negative root -(-1 + sqrt(13))/6 = -A223139/3 = -A356033.
(End)
EXAMPLE
1.7675918792439982155198702112450826577085494289742...
MATHEMATICA
r = 7/3; t = (r + (-4 + r^2)^(1/2))/2; FullSimplify[t]
N[t, 130]
RealDigits[N[t, 130]][[1]]
ContinuedFraction[t, 120]
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Clark Kimberling, Apr 14 2011
STATUS
approved