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

Author

Christopher Hunt Gribble, Sep 30 2009

Keywords

• nonn

Links

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

Crossrefs

Cf. A165913.

Extensions

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