A006374 - cp's OEIS frontend

A006374 Number of positive definite reduced binary quadratic forms of discriminant -4*n.

n	a(n)
1	1
2	1
3	2
4	2
5	2
6	2
7	2
8	3
9	3
10	2
11	4
12	4
13	2
14	4
15	4
16	4
17	4
18	3
19	4
20	6
21	4
22	2
23	6
24	6
25	3
26	6
27	6
28	4
29	6
30	4
31	6
32	7
33	4
34	4
35	8
36	8
37	2
38	6
39	8
40	6
41	8
42	4
43	4
44	10
45	6
46	4
47	10
48	8
49	5
50	7
51	8
52	6
53	6
54	8
55	8
56	12
57	4
58	2
59	12
60	8
61	6
62	8
63	10
64	8
65	8
66	8
67	4
68	12
69	8
70	4
71	14
72	9
73	4
74	10
75	10
76	10
77	8
78	4
79	10
80	14
81	9
82	4
83	12
84	12
85	4
86	10
87	12
88	6
89	12
90	10
91	8

[1, 1, 2, 2, 2, 2, 2, 3, 3, 2, 4, 4, 2, 4, 4, 4, 4, 3, 4, 6, 4, 2, 6, 6, 3, 6, 6, 4, 6, 4, 6, 7, 4, 4, 8, 8, 2, 6, 8, 6, 8, 4, 4, 10, 6, 4, 10, 8, 5, 7, 8, 6, 6, 8, 8, 12, 4, 2, 12, 8, 6, 8, 10, 8, 8, 8, 4, 12, 8, 4, 14, 9, 4, 10, 10, 10, 8, 4, 10, 14, 9, 4, 12, 12, 4, 10, 12, 6, 12, 10, 8]

cp's OEIS Frontend

A006374 Number of positive definite reduced binary quadratic forms of discriminant -4*n.

Table of values

List of values

n	a(n)
1	1
2	1
3	2
4	2
5	2
6	2
7	2
8	3
9	3
10	2
11	4
12	4
13	2
14	4
15	4
16	4
17	4
18	3
19	4
20	6
21	4
22	2
23	6
24	6
25	3
26	6
27	6
28	4
29	6
30	4
31	6
32	7
33	4
34	4
35	8
36	8
37	2
38	6
39	8
40	6
41	8
42	4
43	4
44	10
45	6
46	4
47	10
48	8
49	5
50	7
51	8
52	6
53	6
54	8
55	8
56	12
57	4
58	2
59	12
60	8
61	6
62	8
63	10
64	8
65	8
66	8
67	4
68	12
69	8
70	4
71	14
72	9
73	4
74	10
75	10
76	10
77	8
78	4
79	10
80	14
81	9
82	4
83	12
84	12
85	4
86	10
87	12
88	6
89	12
90	10
91	8

n	a(n)
1	1
2	1
3	2
4	2
5	2
6	2
7	2
8	3
9	3
10	2
11	4
12	4
13	2
14	4
15	4
16	4
17	4
18	3
19	4
20	6
21	4
22	2
23	6
24	6
25	3
26	6
27	6
28	4
29	6
30	4
31	6
32	7
33	4
34	4
35	8
36	8
37	2
38	6
39	8
40	6
41	8
42	4
43	4
44	10
45	6
46	4
47	10
48	8
49	5
50	7
51	8
52	6
53	6
54	8
55	8
56	12
57	4
58	2
59	12
60	8
61	6
62	8
63	10
64	8
65	8
66	8
67	4
68	12
69	8
70	4
71	14
72	9
73	4
74	10
75	10
76	10
77	8
78	4
79	10
80	14
81	9
82	4
83	12
84	12
85	4
86	10
87	12
88	6
89	12
90	10
91	8

n	a(n)
1	1
2	1
3	2
4	2
5	2
6	2
7	2
8	3
9	3
10	2
11	4
12	4
13	2
14	4
15	4
16	4
17	4
18	3
19	4
20	6
21	4
22	2
23	6
24	6
25	3
26	6
27	6
28	4
29	6
30	4
31	6
32	7
33	4
34	4
35	8
36	8
37	2
38	6
39	8
40	6
41	8
42	4
43	4
44	10
45	6
46	4
47	10
48	8
49	5
50	7
51	8
52	6
53	6
54	8
55	8
56	12
57	4
58	2
59	12
60	8
61	6
62	8
63	10
64	8
65	8
66	8
67	4
68	12
69	8
70	4
71	14
72	9
73	4
74	10
75	10
76	10
77	8
78	4
79	10
80	14
81	9
82	4
83	12
84	12
85	4
86	10
87	12
88	6
89	12
90	10
91	8