A306275 - cp's OEIS frontend

A306275 Number of values 0 < k <= n for which there are no k distinct n-th roots of unity that sum to zero.

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

[1, 1, 2, 2, 4, 2, 6, 4, 6, 4, 10, 2, 12, 6, 8, 8, 16, 2, 18, 4, 12, 10, 22, 2, 20, 12, 18, 6, 28, 2, 30, 16, 20, 16, 24, 2, 36, 18, 24, 4, 40, 2, 42, 10, 8, 22, 46, 2, 42, 4, 32, 12, 52, 2, 40, 6, 36, 28, 58, 2, 60, 30, 12, 32, 48, 2, 66, 16, 44, 4, 70, 2, 72]

cp's OEIS Frontend

A306275 Number of values 0 < k <= n for which there are no k distinct n-th roots of unity that sum to zero.

Table of values

List of values

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

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

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