A003643 - cp's OEIS frontend

A003643 Number of genera of Q(sqrt(-n)), n squarefree.

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

[1, 1, 1, 2, 2, 1, 2, 1, 2, 2, 2, 2, 1, 4, 2, 1, 2, 2, 4, 1, 4, 2, 2, 2, 2, 2, 2, 4, 1, 2, 1, 2, 2, 2, 4, 2, 1, 2, 2, 4, 4, 1, 4, 4, 1, 2, 2, 4, 4, 1, 2, 1, 4, 2, 2, 2, 2, 4, 2, 2, 2, 2, 4, 1, 8, 2, 1, 2, 4, 2, 2, 4, 2, 2, 2, 2, 2, 1, 4, 4, 1, 4, 2, 2, 4, 1, 4, 2, 2, 4, 2, 2, 1, 4, 2, 2, 2, 2, 4, 1, 8, 2, 1, 4, 2]

cp's OEIS Frontend

A003643 Number of genera of Q(sqrt(-n)), n squarefree.

Table of values

List of values

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

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

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