A125877 - cp's OEIS frontend

A125877 Numbers k such that p=26k+1 is prime and cos(2Pi/p) is an algebraic number of a 13-smooth degree, but not 11-smooth.

n	a(n)
1	2
2	3
3	5
4	6
5	12
6	20
7	21
8	26
9	33
10	35
11	36
12	42
13	45
14	48
15	50
16	72
17	75
18	77
19	78
20	80
21	90
22	98
23	105
24	110
25	120
26	125
27	128
28	132
29	135
30	143
31	147
32	156
33	182
34	192
35	225
36	231
37	252
38	260
39	275
40	288
41	297
42	308
43	315
44	330
45	336
46	351
47	363
48	378
49	390
50	392
51	405
52	441
53	450
54	455
55	486
56	500
57	507
58	512

[2, 3, 5, 6, 12, 20, 21, 26, 33, 35, 36, 42, 45, 48, 50, 72, 75, 77, 78, 80, 90, 98, 105, 110, 120, 125, 128, 132, 135, 143, 147, 156, 182, 192, 225, 231, 252, 260, 275, 288, 297, 308, 315, 330, 336, 351, 363, 378, 390, 392, 405, 441, 450, 455, 486, 500, 507, 512]

cp's OEIS Frontend

A125877 Numbers k such that p=26k+1 is prime and cos(2Pi/p) is an algebraic number of a 13-smooth degree, but not 11-smooth.

Table of values

List of values

n	a(n)
1	2
2	3
3	5
4	6
5	12
6	20
7	21
8	26
9	33
10	35
11	36
12	42
13	45
14	48
15	50
16	72
17	75
18	77
19	78
20	80
21	90
22	98
23	105
24	110
25	120
26	125
27	128
28	132
29	135
30	143
31	147
32	156
33	182
34	192
35	225
36	231
37	252
38	260
39	275
40	288
41	297
42	308
43	315
44	330
45	336
46	351
47	363
48	378
49	390
50	392
51	405
52	441
53	450
54	455
55	486
56	500
57	507
58	512

n	a(n)
1	2
2	3
3	5
4	6
5	12
6	20
7	21
8	26
9	33
10	35
11	36
12	42
13	45
14	48
15	50
16	72
17	75
18	77
19	78
20	80
21	90
22	98
23	105
24	110
25	120
26	125
27	128
28	132
29	135
30	143
31	147
32	156
33	182
34	192
35	225
36	231
37	252
38	260
39	275
40	288
41	297
42	308
43	315
44	330
45	336
46	351
47	363
48	378
49	390
50	392
51	405
52	441
53	450
54	455
55	486
56	500
57	507
58	512

cp's OEIS Frontend

A125877 Numbers k such that p=26*k+1 is prime and cos(2*Pi/p) is an algebraic number of a 13-smooth degree, but not 11-smooth.

Table of values

List of values

A125877 Numbers k such that p=26k+1 is prime and cos(2Pi/p) is an algebraic number of a 13-smooth degree, but not 11-smooth.

n	a(n)
1	2
2	3
3	5
4	6
5	12
6	20
7	21
8	26
9	33
10	35
11	36
12	42
13	45
14	48
15	50
16	72
17	75
18	77
19	78
20	80
21	90
22	98
23	105
24	110
25	120
26	125
27	128
28	132
29	135
30	143
31	147
32	156
33	182
34	192
35	225
36	231
37	252
38	260
39	275
40	288
41	297
42	308
43	315
44	330
45	336
46	351
47	363
48	378
49	390
50	392
51	405
52	441
53	450
54	455
55	486
56	500
57	507
58	512