A191410 - cp's OEIS frontend

A191410 Class number, k, of n, i.e.; imaginary quadratic fields negated Q(sqrt(-n))=k, or 0 if n is not a fundamental discriminant (A003657).

n	a(n)
1	0
2	0
3	1
4	1
5	0
6	0
7	1
8	1
9	0
10	0
11	1
12	0
13	0
14	0
15	2
16	0
17	0
18	0
19	1
20	2
21	0
22	0
23	3
24	2
25	0
26	0
27	0
28	0
29	0
30	0
31	3
32	0
33	0
34	0
35	2
36	0
37	0
38	0
39	4
40	2
41	0
42	0
43	1
44	0
45	0
46	0
47	5
48	0
49	0
50	0
51	2
52	2
53	0
54	0
55	4
56	4
57	0
58	0
59	3
60	0
61	0
62	0
63	0
64	0
65	0
66	0
67	1
68	4
69	0
70	0
71	7
72	0
73	0
74	0
75	0
76	0
77	0
78	0
79	5
80	0
81	0
82	0
83	3
84	4
85	0
86	0
87	6
88	2
89	0
90	0
91	2
92	0
93	0
94	0
95	8
96	0
97	0
98	0
99	0
100	0
101	0
102	0
103	5
104	6
105	0

[0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 0, 0, 0, 2, 0, 0, 0, 1, 2, 0, 0, 3, 2, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 2, 0, 0, 0, 4, 2, 0, 0, 1, 0, 0, 0, 5, 0, 0, 0, 2, 2, 0, 0, 4, 4, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 1, 4, 0, 0, 7, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0, 0, 3, 4, 0, 0, 6, 2, 0, 0, 2, 0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 5, 6, 0]

cp's OEIS Frontend

A191410 Class number, k, of n, i.e.; imaginary quadratic fields negated Q(sqrt(-n))=k, or 0 if n is not a fundamental discriminant (A003657).

Table of values

List of values

n	a(n)
1	0
2	0
3	1
4	1
5	0
6	0
7	1
8	1
9	0
10	0
11	1
12	0
13	0
14	0
15	2
16	0
17	0
18	0
19	1
20	2
21	0
22	0
23	3
24	2
25	0
26	0
27	0
28	0
29	0
30	0
31	3
32	0
33	0
34	0
35	2
36	0
37	0
38	0
39	4
40	2
41	0
42	0
43	1
44	0
45	0
46	0
47	5
48	0
49	0
50	0
51	2
52	2
53	0
54	0
55	4
56	4
57	0
58	0
59	3
60	0
61	0
62	0
63	0
64	0
65	0
66	0
67	1
68	4
69	0
70	0
71	7
72	0
73	0
74	0
75	0
76	0
77	0
78	0
79	5
80	0
81	0
82	0
83	3
84	4
85	0
86	0
87	6
88	2
89	0
90	0
91	2
92	0
93	0
94	0
95	8
96	0
97	0
98	0
99	0
100	0
101	0
102	0
103	5
104	6
105	0

n	a(n)
1	0
2	0
3	1
4	1
5	0
6	0
7	1
8	1
9	0
10	0
11	1
12	0
13	0
14	0
15	2
16	0
17	0
18	0
19	1
20	2
21	0
22	0
23	3
24	2
25	0
26	0
27	0
28	0
29	0
30	0
31	3
32	0
33	0
34	0
35	2
36	0
37	0
38	0
39	4
40	2
41	0
42	0
43	1
44	0
45	0
46	0
47	5
48	0
49	0
50	0
51	2
52	2
53	0
54	0
55	4
56	4
57	0
58	0
59	3
60	0
61	0
62	0
63	0
64	0
65	0
66	0
67	1
68	4
69	0
70	0
71	7
72	0
73	0
74	0
75	0
76	0
77	0
78	0
79	5
80	0
81	0
82	0
83	3
84	4
85	0
86	0
87	6
88	2
89	0
90	0
91	2
92	0
93	0
94	0
95	8
96	0
97	0
98	0
99	0
100	0
101	0
102	0
103	5
104	6
105	0

n	a(n)
1	0
2	0
3	1
4	1
5	0
6	0
7	1
8	1
9	0
10	0
11	1
12	0
13	0
14	0
15	2
16	0
17	0
18	0
19	1
20	2
21	0
22	0
23	3
24	2
25	0
26	0
27	0
28	0
29	0
30	0
31	3
32	0
33	0
34	0
35	2
36	0
37	0
38	0
39	4
40	2
41	0
42	0
43	1
44	0
45	0
46	0
47	5
48	0
49	0
50	0
51	2
52	2
53	0
54	0
55	4
56	4
57	0
58	0
59	3
60	0
61	0
62	0
63	0
64	0
65	0
66	0
67	1
68	4
69	0
70	0
71	7
72	0
73	0
74	0
75	0
76	0
77	0
78	0
79	5
80	0
81	0
82	0
83	3
84	4
85	0
86	0
87	6
88	2
89	0
90	0
91	2
92	0
93	0
94	0
95	8
96	0
97	0
98	0
99	0
100	0
101	0
102	0
103	5
104	6
105	0