A051995 - cp's OEIS frontend

A051995 Consider real quadratic fields of ERD-type with class groups of exponent 2 and discriminants of the form D = r^2*k^2+4k, k odd; sequence gives values of r.

n	a(n)
1	9
2	1
3	3
4	1
5	1
6	1
7	19
8	7
9	23
10	25
11	5
12	9
13	1
14	31
15	1
16	7
17	7
18	1
19	3
20	1
21	13
22	41
23	43
24	3
25	15
26	15
27	9
28	3
29	7
30	1
31	49
32	17
33	1
34	53
35	11
36	11
37	19
38	59
39	3
40	1
41	13
42	4
43	1
44	23
45	5
46	15
47	7
48	11
49	27
50	5
51	5
52	1
53	3
54	1
55	7
56	1
57	19
58	3
59	101
60	7
61	3
62	3
63	11
64	25
65	127
66	43
67	7
68	27
69	13
70	29
71	3
72	31
73	3
74	1
75	25
76	59
77	179
78	9
79	7
80	47
81	13

[9, 1, 3, 1, 1, 1, 19, 7, 23, 25, 5, 9, 1, 31, 1, 7, 7, 1, 3, 1, 13, 41, 43, 3, 15, 15, 9, 3, 7, 1, 49, 17, 1, 53, 11, 11, 19, 59, 3, 1, 13, 4, 1, 23, 5, 15, 7, 11, 27, 5, 5, 1, 3, 1, 7, 1, 19, 3, 101, 7, 3, 3, 11, 25, 127, 43, 7, 27, 13, 29, 3, 31, 3, 1, 25, 59, 179, 9, 7, 47, 13]

cp's OEIS Frontend

A051995 Consider real quadratic fields of ERD-type with class groups of exponent 2 and discriminants of the form D = r^2*k^2+4k, k odd; sequence gives values of r.

Table of values

List of values

n	a(n)
1	9
2	1
3	3
4	1
5	1
6	1
7	19
8	7
9	23
10	25
11	5
12	9
13	1
14	31
15	1
16	7
17	7
18	1
19	3
20	1
21	13
22	41
23	43
24	3
25	15
26	15
27	9
28	3
29	7
30	1
31	49
32	17
33	1
34	53
35	11
36	11
37	19
38	59
39	3
40	1
41	13
42	4
43	1
44	23
45	5
46	15
47	7
48	11
49	27
50	5
51	5
52	1
53	3
54	1
55	7
56	1
57	19
58	3
59	101
60	7
61	3
62	3
63	11
64	25
65	127
66	43
67	7
68	27
69	13
70	29
71	3
72	31
73	3
74	1
75	25
76	59
77	179
78	9
79	7
80	47
81	13

n	a(n)
1	9
2	1
3	3
4	1
5	1
6	1
7	19
8	7
9	23
10	25
11	5
12	9
13	1
14	31
15	1
16	7
17	7
18	1
19	3
20	1
21	13
22	41
23	43
24	3
25	15
26	15
27	9
28	3
29	7
30	1
31	49
32	17
33	1
34	53
35	11
36	11
37	19
38	59
39	3
40	1
41	13
42	4
43	1
44	23
45	5
46	15
47	7
48	11
49	27
50	5
51	5
52	1
53	3
54	1
55	7
56	1
57	19
58	3
59	101
60	7
61	3
62	3
63	11
64	25
65	127
66	43
67	7
68	27
69	13
70	29
71	3
72	31
73	3
74	1
75	25
76	59
77	179
78	9
79	7
80	47
81	13

n	a(n)
1	9
2	1
3	3
4	1
5	1
6	1
7	19
8	7
9	23
10	25
11	5
12	9
13	1
14	31
15	1
16	7
17	7
18	1
19	3
20	1
21	13
22	41
23	43
24	3
25	15
26	15
27	9
28	3
29	7
30	1
31	49
32	17
33	1
34	53
35	11
36	11
37	19
38	59
39	3
40	1
41	13
42	4
43	1
44	23
45	5
46	15
47	7
48	11
49	27
50	5
51	5
52	1
53	3
54	1
55	7
56	1
57	19
58	3
59	101
60	7
61	3
62	3
63	11
64	25
65	127
66	43
67	7
68	27
69	13
70	29
71	3
72	31
73	3
74	1
75	25
76	59
77	179
78	9
79	7
80	47
81	13