A327921 - cp's OEIS frontend

A327921 Irregular triangle T read by rows: row n gives the values determining the zeros of the minimal polynomial ps(n, x) of 2*sin(Pi/n) (coefficients in A228786), for n >= 1.

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

[1, 0, 1, 5, 1, 3, 1, 3, 7, 9, 1, 1, 3, 5, 9, 11, 13, 1, 3, 5, 7, 1, 5, 7, 11, 13, 17, 1, 2, 1, 3, 5, 7, 9, 13, 15, 17, 19, 21, 1, 5, 7, 11, 1, 3, 5, 7, 9, 11, 15, 17, 19, 21, 23, 25, 1, 3, 5, 1, 7, 11, 13, 17, 19, 23, 29, 1, 3, 5, 7, 9, 11, 13, 15]

cp's OEIS Frontend

A327921 Irregular triangle T read by rows: row n gives the values determining the zeros of the minimal polynomial ps(n, x) of 2*sin(Pi/n) (coefficients in A228786), for n >= 1.

Table of values

List of values

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

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

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