A319659 - cp's OEIS frontend

A319659 2-rank of the class group of imaginary quadratic field with discriminant -k, k = A003657(n).

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

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

cp's OEIS Frontend

A319659 2-rank of the class group of imaginary quadratic field with discriminant -k, k = A003657(n).

Table of values

List of values

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

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

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