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A165924
a(n) = number of squareful nonzero quadratic residues of n.
1
0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 3, 3, 2, 2, 4, 3, 3, 3, 4, 5, 6, 4, 4, 5, 4, 5, 7, 5, 8, 4, 6, 7, 4, 5, 8, 8, 7, 7, 10, 7, 7, 7, 6, 11, 12, 5, 9, 8, 7, 9, 11, 10, 9, 10, 10, 12, 12, 9, 14, 15, 8, 6, 9, 12, 12, 11, 14, 11, 20, 10, 17, 14, 9, 13, 10, 13, 18, 8, 12, 17, 17, 11, 12, 17
OFFSET
1,10
LINKS
CROSSREFS
Cf. A165919.
Sequence in context: A098014 A059957 A361088 * A212628 A272851 A242258
KEYWORD
nonn
AUTHOR
STATUS
approved