A165924 - cp's OEIS frontend

A165924 a(n) = number of squareful nonzero quadratic residues of n.

n	a(n)
1	0
2	0
3	0
4	0
5	1
6	1
7	1
8	1
9	1
10	2
11	2
12	2
13	3
14	3
15	2
16	2
17	4
18	3
19	3
20	3
21	4
22	5
23	6
24	4
25	4
26	5
27	4
28	5
29	7
30	5
31	8
32	4
33	6
34	7
35	4
36	5
37	8
38	8
39	7
40	7
41	10
42	7
43	7
44	7
45	6
46	11
47	12
48	5
49	9
50	8
51	7
52	9
53	11
54	10
55	9
56	10
57	10
58	12
59	12
60	9
61	14
62	15
63	8
64	6
65	9
66	12
67	12
68	11
69	14
70	11
71	20
72	10
73	17
74	14
75	9
76	13
77	10
78	13
79	18
80	8
81	12
82	17
83	17
84	11
85	12
86	17

[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]

cp's OEIS Frontend

A165924 a(n) = number of squareful nonzero quadratic residues of n.

Table of values

List of values

n	a(n)
1	0
2	0
3	0
4	0
5	1
6	1
7	1
8	1
9	1
10	2
11	2
12	2
13	3
14	3
15	2
16	2
17	4
18	3
19	3
20	3
21	4
22	5
23	6
24	4
25	4
26	5
27	4
28	5
29	7
30	5
31	8
32	4
33	6
34	7
35	4
36	5
37	8
38	8
39	7
40	7
41	10
42	7
43	7
44	7
45	6
46	11
47	12
48	5
49	9
50	8
51	7
52	9
53	11
54	10
55	9
56	10
57	10
58	12
59	12
60	9
61	14
62	15
63	8
64	6
65	9
66	12
67	12
68	11
69	14
70	11
71	20
72	10
73	17
74	14
75	9
76	13
77	10
78	13
79	18
80	8
81	12
82	17
83	17
84	11
85	12
86	17

n	a(n)
1	0
2	0
3	0
4	0
5	1
6	1
7	1
8	1
9	1
10	2
11	2
12	2
13	3
14	3
15	2
16	2
17	4
18	3
19	3
20	3
21	4
22	5
23	6
24	4
25	4
26	5
27	4
28	5
29	7
30	5
31	8
32	4
33	6
34	7
35	4
36	5
37	8
38	8
39	7
40	7
41	10
42	7
43	7
44	7
45	6
46	11
47	12
48	5
49	9
50	8
51	7
52	9
53	11
54	10
55	9
56	10
57	10
58	12
59	12
60	9
61	14
62	15
63	8
64	6
65	9
66	12
67	12
68	11
69	14
70	11
71	20
72	10
73	17
74	14
75	9
76	13
77	10
78	13
79	18
80	8
81	12
82	17
83	17
84	11
85	12
86	17

n	a(n)
1	0
2	0
3	0
4	0
5	1
6	1
7	1
8	1
9	1
10	2
11	2
12	2
13	3
14	3
15	2
16	2
17	4
18	3
19	3
20	3
21	4
22	5
23	6
24	4
25	4
26	5
27	4
28	5
29	7
30	5
31	8
32	4
33	6
34	7
35	4
36	5
37	8
38	8
39	7
40	7
41	10
42	7
43	7
44	7
45	6
46	11
47	12
48	5
49	9
50	8
51	7
52	9
53	11
54	10
55	9
56	10
57	10
58	12
59	12
60	9
61	14
62	15
63	8
64	6
65	9
66	12
67	12
68	11
69	14
70	11
71	20
72	10
73	17
74	14
75	9
76	13
77	10
78	13
79	18
80	8
81	12
82	17
83	17
84	11
85	12
86	17