A317992 - cp's OEIS frontend

A317992 2-rank of the narrow class group of real quadratic field Q(sqrt(k)), k squarefree > 1.

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

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

cp's OEIS Frontend

A317992 2-rank of the narrow class group of real quadratic field Q(sqrt(k)), k squarefree > 1.

Table of values

List of values

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

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

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