A317991 - cp's OEIS frontend

A317991 2-rank of the narrow class group of real quadratic field with discriminant A003658(n), n >= 2.

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

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

cp's OEIS Frontend

A317991 2-rank of the narrow class group of real quadratic field with discriminant A003658(n), n >= 2.

Table of values

List of values

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

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

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