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A140397
a(n) = floor(3*phi*n) - 3*floor(phi*n) where phi = (1+sqrt(5))/2.
13
1, 0, 2, 1, 0, 2, 0, 2, 1, 0, 2, 1, 0, 1, 0, 2, 1, 0, 2, 1, 2, 1, 0, 2, 1, 0, 2, 0, 2, 1, 0, 2, 1, 0, 1, 0, 2, 1, 0, 2, 1, 2, 1, 0, 2, 1, 0, 1, 0, 2, 1, 0, 2, 1, 2, 1, 0, 2, 1, 0, 2, 0, 2, 1, 0, 2, 1, 0, 1, 0, 2, 1, 0, 2, 1, 2, 1, 0, 2, 1, 0, 2, 0, 2, 1, 0, 2, 1, 0, 1, 0, 2, 1, 0, 2, 0, 2, 1, 0
OFFSET
1,3
FORMULA
a(n) = floor(n*s^2)-floor(s*floor(n*s)), where s=1+phi.
PROG
(PARI) a(n) = my(fhi=(1+sqrt(5))/2); floor(3*fhi*n) - 3*floor(fhi*n); \\ Michel Marcus, Aug 26 2013
KEYWORD
nonn
AUTHOR
Fred Lunnon, Jun 20 2008
STATUS
approved