OFFSET
1,1
COMMENTS
See A188619 for the definition of 2nd electrum rectangle. Briefly, it is a rectangle such that the removal of a silver rectangle from one end leaves a golden rectangle.
LINKS
Clark Kimberling, A Visual Euclidean Algorithm, The Mathematics Teacher 76 (1983) 108-109.
MATHEMATICA
t=1+3^(1/2); r=(t+(t^2+4)^(1/2))/2
FullSimplify[r]
N[r, 130]
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Clark Kimberling, Apr 06 2011
STATUS
approved