A165915 a(n) = number of squarefree nonzero quadratic residues of n.

0, 1, 1, 1, 1, 2, 2, 1, 2, 3, 3, 1, 3, 4, 3, 1, 4, 4, 6, 2, 3, 6, 5, 1, 6, 8, 6, 2, 7, 6, 7, 2, 5, 10, 7, 2, 10, 11, 6, 1, 10, 8, 14, 4, 5, 12, 11, 2, 12, 13, 10, 4, 15, 11, 8, 1, 9, 17, 17, 2, 16, 16, 7, 5, 11, 11, 21, 6, 9, 12, 15, 1, 19, 23, 12, 6, 13, 14, 21, 3, 18, 24, 24, 4, 14

Offset

1,6

Links

C. H. Gribble, Table of n, a(n) for n=1,...,1000.

Crossrefs

Cf. A165913.

Sequence in context: A368175 A106580 A355080 * A269783 A043276 A319416

Adjacent sequences: A165912 A165913 A165914 * A165916 A165917 A165918

Keyword

nonn

Author

Christopher Hunt Gribble, Sep 30 2009

Extensions

a(1) added and definition corrected by Christopher Hunt Gribble, Oct 05 2009

Status

approved