OFFSET
1,1
LINKS
G. C. Greubel, Table of n, a(n) for n = 1..8000
MATHEMATICA
PROG
(PARI) is(n) = my(u = sin(Pi/3), v = cos(Pi/3)); !(floor(n*u + n*v) - floor(n*u) - floor(n*v)) \\ Iain Fox, Dec 27 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, May 06 2011
STATUS
approved