A003646 - cp's OEIS frontend

A003646 Class number of binary quadratic forms with fundamental discriminant A003658(n),n>=2.

n	a(n)
2	1
3	1
4	2
5	1
6	1
7	2
8	2
9	2
10	1
11	2
12	1
13	2
14	1
15	2
16	1
17	2
18	2
19	4
20	1
21	2
22	2
23	1
24	2
25	2
26	2
27	2
28	1
29	2
30	2
31	1
32	1
33	2
34	4
35	1
36	1
37	4
38	2
39	2
40	2
41	4
42	1
43	4
44	2
45	4
46	1
47	2
48	4
49	1
50	2
51	4
52	4
53	2
54	1
55	2
56	1
57	2
58	2
59	2
60	1
61	1
62	2
63	4
64	4
65	2
66	2
67	2
68	4
69	4
70	3
71	2
72	1
73	2
74	2
75	1
76	2
77	2
78	2
79	3
80	4
81	2
82	2
83	1
84	4
85	1
86	4
87	1
88	2
89	4
90	1
91	2
92	2
93	4
94	2
95	4
96	1
97	6
98	1
99	6
100	4
101	2
102	2
103	1
104	2
105	2
106	4

[1, 1, 2, 1, 1, 2, 2, 2, 1, 2, 1, 2, 1, 2, 1, 2, 2, 4, 1, 2, 2, 1, 2, 2, 2, 2, 1, 2, 2, 1, 1, 2, 4, 1, 1, 4, 2, 2, 2, 4, 1, 4, 2, 4, 1, 2, 4, 1, 2, 4, 4, 2, 1, 2, 1, 2, 2, 2, 1, 1, 2, 4, 4, 2, 2, 2, 4, 4, 3, 2, 1, 2, 2, 1, 2, 2, 2, 3, 4, 2, 2, 1, 4, 1, 4, 1, 2, 4, 1, 2, 2, 4, 2, 4, 1, 6, 1, 6, 4, 2, 2, 1, 2, 2, 4]

cp's OEIS Frontend

A003646 Class number of binary quadratic forms with fundamental discriminant A003658(n),n>=2.

Table of values

List of values

n	a(n)
2	1
3	1
4	2
5	1
6	1
7	2
8	2
9	2
10	1
11	2
12	1
13	2
14	1
15	2
16	1
17	2
18	2
19	4
20	1
21	2
22	2
23	1
24	2
25	2
26	2
27	2
28	1
29	2
30	2
31	1
32	1
33	2
34	4
35	1
36	1
37	4
38	2
39	2
40	2
41	4
42	1
43	4
44	2
45	4
46	1
47	2
48	4
49	1
50	2
51	4
52	4
53	2
54	1
55	2
56	1
57	2
58	2
59	2
60	1
61	1
62	2
63	4
64	4
65	2
66	2
67	2
68	4
69	4
70	3
71	2
72	1
73	2
74	2
75	1
76	2
77	2
78	2
79	3
80	4
81	2
82	2
83	1
84	4
85	1
86	4
87	1
88	2
89	4
90	1
91	2
92	2
93	4
94	2
95	4
96	1
97	6
98	1
99	6
100	4
101	2
102	2
103	1
104	2
105	2
106	4

n	a(n)
2	1
3	1
4	2
5	1
6	1
7	2
8	2
9	2
10	1
11	2
12	1
13	2
14	1
15	2
16	1
17	2
18	2
19	4
20	1
21	2
22	2
23	1
24	2
25	2
26	2
27	2
28	1
29	2
30	2
31	1
32	1
33	2
34	4
35	1
36	1
37	4
38	2
39	2
40	2
41	4
42	1
43	4
44	2
45	4
46	1
47	2
48	4
49	1
50	2
51	4
52	4
53	2
54	1
55	2
56	1
57	2
58	2
59	2
60	1
61	1
62	2
63	4
64	4
65	2
66	2
67	2
68	4
69	4
70	3
71	2
72	1
73	2
74	2
75	1
76	2
77	2
78	2
79	3
80	4
81	2
82	2
83	1
84	4
85	1
86	4
87	1
88	2
89	4
90	1
91	2
92	2
93	4
94	2
95	4
96	1
97	6
98	1
99	6
100	4
101	2
102	2
103	1
104	2
105	2
106	4

n	a(n)
2	1
3	1
4	2
5	1
6	1
7	2
8	2
9	2
10	1
11	2
12	1
13	2
14	1
15	2
16	1
17	2
18	2
19	4
20	1
21	2
22	2
23	1
24	2
25	2
26	2
27	2
28	1
29	2
30	2
31	1
32	1
33	2
34	4
35	1
36	1
37	4
38	2
39	2
40	2
41	4
42	1
43	4
44	2
45	4
46	1
47	2
48	4
49	1
50	2
51	4
52	4
53	2
54	1
55	2
56	1
57	2
58	2
59	2
60	1
61	1
62	2
63	4
64	4
65	2
66	2
67	2
68	4
69	4
70	3
71	2
72	1
73	2
74	2
75	1
76	2
77	2
78	2
79	3
80	4
81	2
82	2
83	1
84	4
85	1
86	4
87	1
88	2
89	4
90	1
91	2
92	2
93	4
94	2
95	4
96	1
97	6
98	1
99	6
100	4
101	2
102	2
103	1
104	2
105	2
106	4