A004169 - cp's OEIS frontend

A004169 Values of m for which a regular polygon with m sides cannot be constructed with ruler and compass.

n	a(n)
1	7
2	9
3	11
4	13
5	14
6	18
7	19
8	21
9	22
10	23
11	25
12	26
13	27
14	28
15	29
16	31
17	33
18	35
19	36
20	37
21	38
22	39
23	41
24	42
25	43
26	44
27	45
28	46
29	47
30	49
31	50
32	52
33	53
34	54
35	55
36	56
37	57
38	58
39	59
40	61
41	62
42	63
43	65
44	66
45	67
46	69
47	70
48	71
49	72
50	73
51	74
52	75
53	76
54	77
55	78
56	79
57	81
58	82
59	83
60	84
61	86
62	87
63	88
64	89
65	90
66	91

[7, 9, 11, 13, 14, 18, 19, 21, 22, 23, 25, 26, 27, 28, 29, 31, 33, 35, 36, 37, 38, 39, 41, 42, 43, 44, 45, 46, 47, 49, 50, 52, 53, 54, 55, 56, 57, 58, 59, 61, 62, 63, 65, 66, 67, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 81, 82, 83, 84, 86, 87, 88, 89, 90, 91]

cp's OEIS Frontend

A004169 Values of m for which a regular polygon with m sides cannot be constructed with ruler and compass.

Table of values

List of values

n	a(n)
1	7
2	9
3	11
4	13
5	14
6	18
7	19
8	21
9	22
10	23
11	25
12	26
13	27
14	28
15	29
16	31
17	33
18	35
19	36
20	37
21	38
22	39
23	41
24	42
25	43
26	44
27	45
28	46
29	47
30	49
31	50
32	52
33	53
34	54
35	55
36	56
37	57
38	58
39	59
40	61
41	62
42	63
43	65
44	66
45	67
46	69
47	70
48	71
49	72
50	73
51	74
52	75
53	76
54	77
55	78
56	79
57	81
58	82
59	83
60	84
61	86
62	87
63	88
64	89
65	90
66	91

n	a(n)
1	7
2	9
3	11
4	13
5	14
6	18
7	19
8	21
9	22
10	23
11	25
12	26
13	27
14	28
15	29
16	31
17	33
18	35
19	36
20	37
21	38
22	39
23	41
24	42
25	43
26	44
27	45
28	46
29	47
30	49
31	50
32	52
33	53
34	54
35	55
36	56
37	57
38	58
39	59
40	61
41	62
42	63
43	65
44	66
45	67
46	69
47	70
48	71
49	72
50	73
51	74
52	75
53	76
54	77
55	78
56	79
57	81
58	82
59	83
60	84
61	86
62	87
63	88
64	89
65	90
66	91

n	a(n)
1	7
2	9
3	11
4	13
5	14
6	18
7	19
8	21
9	22
10	23
11	25
12	26
13	27
14	28
15	29
16	31
17	33
18	35
19	36
20	37
21	38
22	39
23	41
24	42
25	43
26	44
27	45
28	46
29	47
30	49
31	50
32	52
33	53
34	54
35	55
36	56
37	57
38	58
39	59
40	61
41	62
42	63
43	65
44	66
45	67
46	69
47	70
48	71
49	72
50	73
51	74
52	75
53	76
54	77
55	78
56	79
57	81
58	82
59	83
60	84
61	86
62	87
63	88
64	89
65	90
66	91