A260421 - cp's OEIS frontend

A260421 a(1) = 1, a(A206074(n)) = 1 + (2a(n)), a(A205783(1+n)) = 2a(n), where A206074 and A205783 give binary codes for polynomials with coefficients 0 or 1 that are irreducible [resp. reducible] over Q.

n	a(n)
1	1
2	3
3	7
4	2
5	15
6	6
7	5
8	14
9	4
10	30
11	31
12	12
13	13
14	10
15	28
16	8
17	11
18	60
19	29
20	62
21	24
22	26
23	9
24	20
25	61
26	56
27	16
28	22
29	63
30	120
31	25
32	58
33	124
34	48
35	52
36	18
37	27
38	40
39	122
40	112
41	21
42	32
43	57
44	44
45	126
46	240
47	17
48	50
49	116
50	248
51	96
52	104
53	23
54	36
55	121
56	54
57	80
58	244
59	59
60	224
61	125
62	42
63	64
64	114
65	88
66	252
67	49
68	480
69	53
70	34
71	19
72	100
73	41
74	232
75	496
76	192
77	123
78	208
79	113
80	46
81	33
82	72
83	45

[1, 3, 7, 2, 15, 6, 5, 14, 4, 30, 31, 12, 13, 10, 28, 8, 11, 60, 29, 62, 24, 26, 9, 20, 61, 56, 16, 22, 63, 120, 25, 58, 124, 48, 52, 18, 27, 40, 122, 112, 21, 32, 57, 44, 126, 240, 17, 50, 116, 248, 96, 104, 23, 36, 121, 54, 80, 244, 59, 224, 125, 42, 64, 114, 88, 252, 49, 480, 53, 34, 19, 100, 41, 232, 496, 192, 123, 208, 113, 46, 33, 72, 45]

cp's OEIS Frontend

A260421 a(1) = 1, a(A206074(n)) = 1 + (2a(n)), a(A205783(1+n)) = 2a(n), where A206074 and A205783 give binary codes for polynomials with coefficients 0 or 1 that are irreducible [resp. reducible] over Q.

Table of values

List of values

n	a(n)
1	1
2	3
3	7
4	2
5	15
6	6
7	5
8	14
9	4
10	30
11	31
12	12
13	13
14	10
15	28
16	8
17	11
18	60
19	29
20	62
21	24
22	26
23	9
24	20
25	61
26	56
27	16
28	22
29	63
30	120
31	25
32	58
33	124
34	48
35	52
36	18
37	27
38	40
39	122
40	112
41	21
42	32
43	57
44	44
45	126
46	240
47	17
48	50
49	116
50	248
51	96
52	104
53	23
54	36
55	121
56	54
57	80
58	244
59	59
60	224
61	125
62	42
63	64
64	114
65	88
66	252
67	49
68	480
69	53
70	34
71	19
72	100
73	41
74	232
75	496
76	192
77	123
78	208
79	113
80	46
81	33
82	72
83	45

n	a(n)
1	1
2	3
3	7
4	2
5	15
6	6
7	5
8	14
9	4
10	30
11	31
12	12
13	13
14	10
15	28
16	8
17	11
18	60
19	29
20	62
21	24
22	26
23	9
24	20
25	61
26	56
27	16
28	22
29	63
30	120
31	25
32	58
33	124
34	48
35	52
36	18
37	27
38	40
39	122
40	112
41	21
42	32
43	57
44	44
45	126
46	240
47	17
48	50
49	116
50	248
51	96
52	104
53	23
54	36
55	121
56	54
57	80
58	244
59	59
60	224
61	125
62	42
63	64
64	114
65	88
66	252
67	49
68	480
69	53
70	34
71	19
72	100
73	41
74	232
75	496
76	192
77	123
78	208
79	113
80	46
81	33
82	72
83	45

cp's OEIS Frontend

A260421 a(1) = 1, a(A206074(n)) = 1 + (2*a(n)), a(A205783(1+n)) = 2*a(n), where A206074 and A205783 give binary codes for polynomials with coefficients 0 or 1 that are irreducible [resp. reducible] over Q.

Table of values

List of values

A260421 a(1) = 1, a(A206074(n)) = 1 + (2a(n)), a(A205783(1+n)) = 2a(n), where A206074 and A205783 give binary codes for polynomials with coefficients 0 or 1 that are irreducible [resp. reducible] over Q.

n	a(n)
1	1
2	3
3	7
4	2
5	15
6	6
7	5
8	14
9	4
10	30
11	31
12	12
13	13
14	10
15	28
16	8
17	11
18	60
19	29
20	62
21	24
22	26
23	9
24	20
25	61
26	56
27	16
28	22
29	63
30	120
31	25
32	58
33	124
34	48
35	52
36	18
37	27
38	40
39	122
40	112
41	21
42	32
43	57
44	44
45	126
46	240
47	17
48	50
49	116
50	248
51	96
52	104
53	23
54	36
55	121
56	54
57	80
58	244
59	59
60	224
61	125
62	42
63	64
64	114
65	88
66	252
67	49
68	480
69	53
70	34
71	19
72	100
73	41
74	232
75	496
76	192
77	123
78	208
79	113
80	46
81	33
82	72
83	45