A261406 - cp's OEIS frontend

A261406 Numbers n such that the norm of Phi_n(alpha), the n-th cyclotomic polynomial evaluated at alpha, is +-1, where alpha is the Salem number defined in A073011.

n	a(n)
1	1
2	2
3	3
4	5
5	6
6	7
7	8
8	9
9	10
10	11
11	13
12	16
13	17
14	18
15	20
16	21
17	23
18	24
19	27
20	28
21	29
22	30
23	34
24	37
25	38
26	40
27	42
28	44
29	45
30	47
31	50
32	52
33	56
34	57
35	60
36	63
37	65
38	66
39	70
40	74
41	75
42	76
43	78
44	84
45	86
46	92
47	96
48	98
49	105
50	110
51	118
52	132
53	138
54	144
55	154
56	160
57	165
58	186
59	195
60	204
61	212
62	240
63	270
64	286
65	360

[1, 2, 3, 5, 6, 7, 8, 9, 10, 11, 13, 16, 17, 18, 20, 21, 23, 24, 27, 28, 29, 30, 34, 37, 38, 40, 42, 44, 45, 47, 50, 52, 56, 57, 60, 63, 65, 66, 70, 74, 75, 76, 78, 84, 86, 92, 96, 98, 105, 110, 118, 132, 138, 144, 154, 160, 165, 186, 195, 204, 212, 240, 270, 286, 360]

cp's OEIS Frontend

A261406 Numbers n such that the norm of Phi_n(alpha), the n-th cyclotomic polynomial evaluated at alpha, is +-1, where alpha is the Salem number defined in A073011.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	5
5	6
6	7
7	8
8	9
9	10
10	11
11	13
12	16
13	17
14	18
15	20
16	21
17	23
18	24
19	27
20	28
21	29
22	30
23	34
24	37
25	38
26	40
27	42
28	44
29	45
30	47
31	50
32	52
33	56
34	57
35	60
36	63
37	65
38	66
39	70
40	74
41	75
42	76
43	78
44	84
45	86
46	92
47	96
48	98
49	105
50	110
51	118
52	132
53	138
54	144
55	154
56	160
57	165
58	186
59	195
60	204
61	212
62	240
63	270
64	286
65	360

n	a(n)
1	1
2	2
3	3
4	5
5	6
6	7
7	8
8	9
9	10
10	11
11	13
12	16
13	17
14	18
15	20
16	21
17	23
18	24
19	27
20	28
21	29
22	30
23	34
24	37
25	38
26	40
27	42
28	44
29	45
30	47
31	50
32	52
33	56
34	57
35	60
36	63
37	65
38	66
39	70
40	74
41	75
42	76
43	78
44	84
45	86
46	92
47	96
48	98
49	105
50	110
51	118
52	132
53	138
54	144
55	154
56	160
57	165
58	186
59	195
60	204
61	212
62	240
63	270
64	286
65	360

n	a(n)
1	1
2	2
3	3
4	5
5	6
6	7
7	8
8	9
9	10
10	11
11	13
12	16
13	17
14	18
15	20
16	21
17	23
18	24
19	27
20	28
21	29
22	30
23	34
24	37
25	38
26	40
27	42
28	44
29	45
30	47
31	50
32	52
33	56
34	57
35	60
36	63
37	65
38	66
39	70
40	74
41	75
42	76
43	78
44	84
45	86
46	92
47	96
48	98
49	105
50	110
51	118
52	132
53	138
54	144
55	154
56	160
57	165
58	186
59	195
60	204
61	212
62	240
63	270
64	286
65	360