A165915 - cp's OEIS frontend

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

n	a(n)
1	0
2	1
3	1
4	1
5	1
6	2
7	2
8	1
9	2
10	3
11	3
12	1
13	3
14	4
15	3
16	1
17	4
18	4
19	6
20	2
21	3
22	6
23	5
24	1
25	6
26	8
27	6
28	2
29	7
30	6
31	7
32	2
33	5
34	10
35	7
36	2
37	10
38	11
39	6
40	1
41	10
42	8
43	14
44	4
45	5
46	12
47	11
48	2
49	12
50	13
51	10
52	4
53	15
54	11
55	8
56	1
57	9
58	17
59	17
60	2
61	16
62	16
63	7
64	5
65	11
66	11
67	21
68	6
69	9
70	12
71	15
72	1
73	19
74	23
75	12
76	6
77	13
78	14
79	21
80	3
81	18
82	24
83	24
84	4
85	14

[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]

cp's OEIS Frontend

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

Table of values

List of values

n	a(n)
1	0
2	1
3	1
4	1
5	1
6	2
7	2
8	1
9	2
10	3
11	3
12	1
13	3
14	4
15	3
16	1
17	4
18	4
19	6
20	2
21	3
22	6
23	5
24	1
25	6
26	8
27	6
28	2
29	7
30	6
31	7
32	2
33	5
34	10
35	7
36	2
37	10
38	11
39	6
40	1
41	10
42	8
43	14
44	4
45	5
46	12
47	11
48	2
49	12
50	13
51	10
52	4
53	15
54	11
55	8
56	1
57	9
58	17
59	17
60	2
61	16
62	16
63	7
64	5
65	11
66	11
67	21
68	6
69	9
70	12
71	15
72	1
73	19
74	23
75	12
76	6
77	13
78	14
79	21
80	3
81	18
82	24
83	24
84	4
85	14

n	a(n)
1	0
2	1
3	1
4	1
5	1
6	2
7	2
8	1
9	2
10	3
11	3
12	1
13	3
14	4
15	3
16	1
17	4
18	4
19	6
20	2
21	3
22	6
23	5
24	1
25	6
26	8
27	6
28	2
29	7
30	6
31	7
32	2
33	5
34	10
35	7
36	2
37	10
38	11
39	6
40	1
41	10
42	8
43	14
44	4
45	5
46	12
47	11
48	2
49	12
50	13
51	10
52	4
53	15
54	11
55	8
56	1
57	9
58	17
59	17
60	2
61	16
62	16
63	7
64	5
65	11
66	11
67	21
68	6
69	9
70	12
71	15
72	1
73	19
74	23
75	12
76	6
77	13
78	14
79	21
80	3
81	18
82	24
83	24
84	4
85	14

n	a(n)
1	0
2	1
3	1
4	1
5	1
6	2
7	2
8	1
9	2
10	3
11	3
12	1
13	3
14	4
15	3
16	1
17	4
18	4
19	6
20	2
21	3
22	6
23	5
24	1
25	6
26	8
27	6
28	2
29	7
30	6
31	7
32	2
33	5
34	10
35	7
36	2
37	10
38	11
39	6
40	1
41	10
42	8
43	14
44	4
45	5
46	12
47	11
48	2
49	12
50	13
51	10
52	4
53	15
54	11
55	8
56	1
57	9
58	17
59	17
60	2
61	16
62	16
63	7
64	5
65	11
66	11
67	21
68	6
69	9
70	12
71	15
72	1
73	19
74	23
75	12
76	6
77	13
78	14
79	21
80	3
81	18
82	24
83	24
84	4
85	14