A125873 - cp's OEIS frontend

A125873 Prime numbers n such that cos(2pi/n) is an algebraic number of an 11-smooth degree, but not 7-smooth.

n	a(n)
1	23
2	67
3	89
4	199
5	331
6	353
7	397
8	463
9	617
10	661
11	727
12	881
13	991
14	1321
15	1409
16	1453
17	1783
18	2113
19	2179
20	2311
21	2377
22	2663
23	2971
24	3169
25	3301
26	3389
27	3631
28	3697
29	3851
30	4159
31	4357
32	4621
33	4951
34	5281
35	5347
36	5501
37	6337
38	6469
39	7129
40	7393
41	7547
42	8317
43	8713

[23, 67, 89, 199, 331, 353, 397, 463, 617, 661, 727, 881, 991, 1321, 1409, 1453, 1783, 2113, 2179, 2311, 2377, 2663, 2971, 3169, 3301, 3389, 3631, 3697, 3851, 4159, 4357, 4621, 4951, 5281, 5347, 5501, 6337, 6469, 7129, 7393, 7547, 8317, 8713]

cp's OEIS Frontend

A125873 Prime numbers n such that cos(2pi/n) is an algebraic number of an 11-smooth degree, but not 7-smooth.

Table of values

List of values