OFFSET
0,1
COMMENTS
a(3n+2) = 0, a(3n) = a(3n+1). a(3n) may be equal to A088917(n).
LINKS
FORMULA
a(n)=sum{k=0..floor(n/2), L(C(n-k,k)/3)} mod 2 where L(j/p) is the Legendre symbol of j and p.
a(2*A081601(n)) = a(1+2*A081601(n)) = 1. [Conjectured, also these two formulas together seem to give the positions of all 1's] - Antti Karttunen, Jan 01 2023
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Apr 05 2006
STATUS
approved