A260424 - cp's OEIS frontend

A260424 a(1) = 1, a(A206074(n)) = prime(a(n)), a(A205783(1+n)) = composite(a(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	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	10
11	11
12	12
13	13
14	14
15	15
16	16
17	17
18	18
19	19
20	20
21	21
22	22
23	23
24	24
25	29
26	25
27	26
28	27
29	31
30	28
31	37
32	30
33	32
34	33
35	34
36	35
37	41
38	36
39	44
40	38
41	43
42	39
43	47
44	40
45	46
46	42
47	53
48	54
49	45
50	48
51	49
52	50
53	59
54	51
55	61
56	58
57	52
58	63
59	67
60	55
61	71
62	62
63	56
64	66
65	57
66	65
67	73
68	60
69	79
70	75
71	83
72	76
73	89
74	64
75	68
76	69
77	109
78	70
79	97
80	82
81	101
82	72
83	103
84	85
85	81
86	74
87	127

[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 29, 25, 26, 27, 31, 28, 37, 30, 32, 33, 34, 35, 41, 36, 44, 38, 43, 39, 47, 40, 46, 42, 53, 54, 45, 48, 49, 50, 59, 51, 61, 58, 52, 63, 67, 55, 71, 62, 56, 66, 57, 65, 73, 60, 79, 75, 83, 76, 89, 64, 68, 69, 109, 70, 97, 82, 101, 72, 103, 85, 81, 74, 127]

cp's OEIS Frontend

A260424 a(1) = 1, a(A206074(n)) = prime(a(n)), a(A205783(1+n)) = composite(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

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	10
11	11
12	12
13	13
14	14
15	15
16	16
17	17
18	18
19	19
20	20
21	21
22	22
23	23
24	24
25	29
26	25
27	26
28	27
29	31
30	28
31	37
32	30
33	32
34	33
35	34
36	35
37	41
38	36
39	44
40	38
41	43
42	39
43	47
44	40
45	46
46	42
47	53
48	54
49	45
50	48
51	49
52	50
53	59
54	51
55	61
56	58
57	52
58	63
59	67
60	55
61	71
62	62
63	56
64	66
65	57
66	65
67	73
68	60
69	79
70	75
71	83
72	76
73	89
74	64
75	68
76	69
77	109
78	70
79	97
80	82
81	101
82	72
83	103
84	85
85	81
86	74
87	127

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	10
11	11
12	12
13	13
14	14
15	15
16	16
17	17
18	18
19	19
20	20
21	21
22	22
23	23
24	24
25	29
26	25
27	26
28	27
29	31
30	28
31	37
32	30
33	32
34	33
35	34
36	35
37	41
38	36
39	44
40	38
41	43
42	39
43	47
44	40
45	46
46	42
47	53
48	54
49	45
50	48
51	49
52	50
53	59
54	51
55	61
56	58
57	52
58	63
59	67
60	55
61	71
62	62
63	56
64	66
65	57
66	65
67	73
68	60
69	79
70	75
71	83
72	76
73	89
74	64
75	68
76	69
77	109
78	70
79	97
80	82
81	101
82	72
83	103
84	85
85	81
86	74
87	127

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	10
11	11
12	12
13	13
14	14
15	15
16	16
17	17
18	18
19	19
20	20
21	21
22	22
23	23
24	24
25	29
26	25
27	26
28	27
29	31
30	28
31	37
32	30
33	32
34	33
35	34
36	35
37	41
38	36
39	44
40	38
41	43
42	39
43	47
44	40
45	46
46	42
47	53
48	54
49	45
50	48
51	49
52	50
53	59
54	51
55	61
56	58
57	52
58	63
59	67
60	55
61	71
62	62
63	56
64	66
65	57
66	65
67	73
68	60
69	79
70	75
71	83
72	76
73	89
74	64
75	68
76	69
77	109
78	70
79	97
80	82
81	101
82	72
83	103
84	85
85	81
86	74
87	127