A003647 - cp's OEIS frontend

A003647 Class number of real quadratic forms with discriminant 4n+1.

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

[1, 1, 1, 2, 1, 2, 1, 1, 1, 2, 1, 2, 2, 1, 2, 2, 1, 2, 1, 1, 4, 1, 1, 2, 2, 1, 2, 4, 1, 1, 2, 4, 1, 2, 1, 2, 1, 1, 2, 4, 2, 2, 2, 4, 3, 1, 2, 1, 2, 2, 3, 2, 1, 4, 1, 1, 4, 1, 2, 4, 2, 1, 1, 6, 2, 1, 2, 4, 1, 1, 4, 2, 1, 4, 2, 4, 1, 2, 1, 5, 1, 2, 2, 1, 4, 1, 2, 4, 1, 2, 1, 1, 4, 6, 6, 2, 2, 2, 2, 2, 2, 8, 1, 2, 1]

cp's OEIS Frontend

A003647 Class number of real quadratic forms with discriminant 4n+1.

Table of values

List of values

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

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

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