OFFSET
0,1
LINKS
Paul N. Suding and Robert M. Ziff, Site percolation thresholds for Archimedean lattices, arXiv:cond-mat/9811416 [cond-mat.dis-nn], 1998.
Paul N. Suding and Robert M. Ziff, Site percolation thresholds for Archimedean lattices, Phys. Rev. E 60, 275 (1999): 275-283. Bibcode 1999PhRvE..60..275S.
Wikipedia, Percolation threshold.
FORMULA
Equals (1 - 2*sin(Pi/18))^(1/2).
EXAMPLE
0.80790076412028433128335203932861191473183501086272...
MATHEMATICA
RealDigits[Sqrt[1 - 2*Sin[Pi/18]], 10, 120][[1]] (* Amiram Eldar, Jun 25 2023 *)
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Jonathan Vos Post, Dec 22 2012
STATUS
approved