A191411 - cp's OEIS frontend

A191411 Class number, k, of n; i.e., imaginary quadratic fields negated Q(sqrt(-n))=k, or 0 if n is not squarefree (A005117).

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

[1, 1, 1, 0, 2, 2, 1, 0, 0, 2, 1, 0, 2, 4, 2, 0, 4, 0, 1, 0, 4, 2, 3, 0, 0, 6, 0, 0, 6, 4, 3, 0, 4, 4, 2, 0, 2, 6, 4, 0, 8, 4, 1, 0, 0, 4, 5, 0, 0, 0, 2, 0, 6, 0, 4, 0, 4, 2, 3, 0, 6, 8, 0, 0, 8, 8, 1, 0, 8, 4, 7, 0, 4, 10, 0, 0, 8, 4, 5, 0, 0, 4, 3, 0, 4, 10, 6, 0, 12, 0, 2, 0, 4, 8, 8, 0, 4, 0, 0, 0, 14, 4, 5, 0, 8]

cp's OEIS Frontend

A191411 Class number, k, of n; i.e., imaginary quadratic fields negated Q(sqrt(-n))=k, or 0 if n is not squarefree (A005117).

Table of values

List of values

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

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

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