A181932 A003136(n) mod 2.

0, 1, 1, 0, 1, 1, 0, 1, 0, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 0, 1

Offset

1

Links

Charles R Greathouse IV, Table of n, a(n) for n = 1..10000

Prog

(PARI) do(lim)=my(v=List(), y, t); for(x=0, sqrtint(lim\3), my(y=x, t); while((t=x^2+x*y+y^2)<=lim, listput(v, t); y++)); Set(v)%2 \\ Charles R Greathouse IV, Jul 05 2017

Crossrefs

Sequence in context: A082410 A189479 A260394 * A284792 A094217 A280261

Adjacent sequences: A181929 A181930 A181931 * A181933 A181934 A181935

Keyword

nonn

Author

N. J. A. Sloane, Apr 02 2012

Status

approved