A003649 - cp's OEIS frontend

A003649 Class number of real quadratic field Q(sqrt f), where f is the n-th squarefree number A005117(n).

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

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

cp's OEIS Frontend

A003649 Class number of real quadratic field Q(sqrt f), where f is the n-th squarefree number A005117(n).

Table of values

List of values

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

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

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