A125872 - cp's OEIS frontend

A125872 Odd numbers k such that cos(2*Pi/k) is an algebraic number of an 11-smooth degree, but not 7-smooth.

n	a(n)
1	23
2	67
3	69
4	89
5	115
6	121
7	161
8	199
9	201
10	207
11	253
12	267
13	299
14	331
15	335
16	345
17	353
18	363
19	391
20	397
21	437
22	445
23	463
24	469
25	483
26	575
27	597
28	603
29	605
30	617
31	621
32	623
33	661
34	667
35	713
36	727
37	737
38	759
39	801
40	805
41	847
42	851
43	871
44	881
45	897
46	943
47	979
48	989
49	991
50	993
51	995
52	1005

[23, 67, 69, 89, 115, 121, 161, 199, 201, 207, 253, 267, 299, 331, 335, 345, 353, 363, 391, 397, 437, 445, 463, 469, 483, 575, 597, 603, 605, 617, 621, 623, 661, 667, 713, 727, 737, 759, 801, 805, 847, 851, 871, 881, 897, 943, 979, 989, 991, 993, 995, 1005]

cp's OEIS Frontend

A125872 Odd numbers k such that cos(2*Pi/k) is an algebraic number of an 11-smooth degree, but not 7-smooth.

Table of values

List of values