A216845 - cp's OEIS frontend

A216845 Numbers n such that the polynomial 1 + x + x^2 + x^3 + x^4 + ... + x^(n-1) is reducible over GF(2).

n	a(n)
1	4
2	6
3	7
4	8
5	9
6	10
7	12
8	14
9	15
10	16
11	17
12	18
13	20
14	21
15	22
16	23
17	24
18	25
19	26
20	27
21	28
22	30
23	31
24	32
25	33
26	34
27	35
28	36
29	38
30	39
31	40
32	41
33	42
34	43
35	44
36	45
37	46
38	47
39	48
40	49
41	50
42	51
43	52
44	54
45	55
46	56
47	57
48	58
49	60
50	62
51	63
52	64
53	65
54	66
55	68
56	69
57	70
58	71
59	72
60	73
61	74
62	75
63	76
64	77
65	78
66	79

[4, 6, 7, 8, 9, 10, 12, 14, 15, 16, 17, 18, 20, 21, 22, 23, 24, 25, 26, 27, 28, 30, 31, 32, 33, 34, 35, 36, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 54, 55, 56, 57, 58, 60, 62, 63, 64, 65, 66, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79]

cp's OEIS Frontend

A216845 Numbers n such that the polynomial 1 + x + x^2 + x^3 + x^4 + ... + x^(n-1) is reducible over GF(2).

Table of values

List of values

n	a(n)
1	4
2	6
3	7
4	8
5	9
6	10
7	12
8	14
9	15
10	16
11	17
12	18
13	20
14	21
15	22
16	23
17	24
18	25
19	26
20	27
21	28
22	30
23	31
24	32
25	33
26	34
27	35
28	36
29	38
30	39
31	40
32	41
33	42
34	43
35	44
36	45
37	46
38	47
39	48
40	49
41	50
42	51
43	52
44	54
45	55
46	56
47	57
48	58
49	60
50	62
51	63
52	64
53	65
54	66
55	68
56	69
57	70
58	71
59	72
60	73
61	74
62	75
63	76
64	77
65	78
66	79

n	a(n)
1	4
2	6
3	7
4	8
5	9
6	10
7	12
8	14
9	15
10	16
11	17
12	18
13	20
14	21
15	22
16	23
17	24
18	25
19	26
20	27
21	28
22	30
23	31
24	32
25	33
26	34
27	35
28	36
29	38
30	39
31	40
32	41
33	42
34	43
35	44
36	45
37	46
38	47
39	48
40	49
41	50
42	51
43	52
44	54
45	55
46	56
47	57
48	58
49	60
50	62
51	63
52	64
53	65
54	66
55	68
56	69
57	70
58	71
59	72
60	73
61	74
62	75
63	76
64	77
65	78
66	79

n	a(n)
1	4
2	6
3	7
4	8
5	9
6	10
7	12
8	14
9	15
10	16
11	17
12	18
13	20
14	21
15	22
16	23
17	24
18	25
19	26
20	27
21	28
22	30
23	31
24	32
25	33
26	34
27	35
28	36
29	38
30	39
31	40
32	41
33	42
34	43
35	44
36	45
37	46
38	47
39	48
40	49
41	50
42	51
43	52
44	54
45	55
46	56
47	57
48	58
49	60
50	62
51	63
52	64
53	65
54	66
55	68
56	69
57	70
58	71
59	72
60	73
61	74
62	75
63	76
64	77
65	78
66	79