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A105612 Number of nonzero quadratic residues (mod n) (cf. A000224). +0
4
0, 1, 1, 1, 2, 3, 3, 2, 3, 5, 5, 3, 6, 7, 5, 3, 8, 7, 9, 5, 7, 11, 11, 5, 10, 13, 10, 7, 14, 11, 15, 6, 11, 17, 11, 7, 18, 19, 13, 8, 20, 15, 21, 11, 11, 23, 23, 7, 21, 21, 17, 13, 26, 21, 17, 11, 19, 29, 29, 11, 30, 31, 15, 11, 20, 23, 33, 17, 23, 23, 35, 11, 36, 37, 21, 19, 23 (list; graph; listen)
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Last modified December 2 11:54 EST 2009. Contains 167921 sequences.


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