A319660 - cp's OEIS frontend

A319660 2-rank of the class group of imaginary quadratic field with discriminant -k, k = A039957(n).

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

[0, 0, 0, 1, 0, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 0, 1, 0, 1, 1, 0, 0, 0, 1, 1, 0, 2, 0, 1, 0, 1, 1, 0, 0, 2, 1, 0, 1, 0, 2, 1, 0, 1, 0, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 2, 1, 1, 1, 1, 0]

cp's OEIS Frontend

A319660 2-rank of the class group of imaginary quadratic field with discriminant -k, k = A039957(n).

Table of values

List of values

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

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

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