A387203 - cp's OEIS frontend

A387203 Number of additively indecomposable elements in the real quadratic field Q(sqrt(D)) up to multiplication by totally positive units, where D = A005117(n) is the n-th squarefree number.

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

[2, 1, 1, 2, 2, 6, 3, 3, 2, 1, 5, 7, 1, 6, 2, 10, 5, 2, 8, 4, 2, 1, 7, 6, 4, 11, 2, 13, 8, 2, 7, 7, 4, 7, 20, 9, 11, 2, 9, 8, 19, 2, 6, 6, 21, 20, 1, 2, 2, 18, 9, 9, 16, 3, 21, 12, 3, 12, 2, 27, 11, 10, 18, 3, 34, 13, 17, 2, 8, 23, 12, 5, 18, 2, 22, 11, 24, 15, 26, 15, 6, 22, 27, 2, 31, 4, 2]

cp's OEIS Frontend

A387203 Number of additively indecomposable elements in the real quadratic field Q(sqrt(D)) up to multiplication by totally positive units, where D = A005117(n) is the n-th squarefree number.

Table of values

List of values

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

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

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