A260423 - cp's OEIS frontend

A260423 a(1) = 1, a(prime(n)) = A206074(a(n)), a(composite(n)) = A205783(1+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	26
26	27
27	28
28	30
29	25
30	32
31	29
32	33
33	34
34	35
35	36
36	38
37	31
38	40
39	42
40	44
41	37
42	46
43	41
44	39
45	49
46	45
47	43
48	50
49	51
50	52
51	54
52	57
53	47
54	48
55	60
56	63
57	65
58	56
59	53
60	68
61	55
62	62
63	58
64	74
65	66
66	64
67	59
68	75
69	76
70	78
71	61
72	82
73	67
74	86
75	70
76	72
77	92
78	95
79	69
80	98
81	85
82	80
83	71
84	102
85	84
86	94
87	88
88	111

[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 26, 27, 28, 30, 25, 32, 29, 33, 34, 35, 36, 38, 31, 40, 42, 44, 37, 46, 41, 39, 49, 45, 43, 50, 51, 52, 54, 57, 47, 48, 60, 63, 65, 56, 53, 68, 55, 62, 58, 74, 66, 64, 59, 75, 76, 78, 61, 82, 67, 86, 70, 72, 92, 95, 69, 98, 85, 80, 71, 102, 84, 94, 88, 111]

cp's OEIS Frontend

A260423 a(1) = 1, a(prime(n)) = A206074(a(n)), a(composite(n)) = A205783(1+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	26
26	27
27	28
28	30
29	25
30	32
31	29
32	33
33	34
34	35
35	36
36	38
37	31
38	40
39	42
40	44
41	37
42	46
43	41
44	39
45	49
46	45
47	43
48	50
49	51
50	52
51	54
52	57
53	47
54	48
55	60
56	63
57	65
58	56
59	53
60	68
61	55
62	62
63	58
64	74
65	66
66	64
67	59
68	75
69	76
70	78
71	61
72	82
73	67
74	86
75	70
76	72
77	92
78	95
79	69
80	98
81	85
82	80
83	71
84	102
85	84
86	94
87	88
88	111

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	26
26	27
27	28
28	30
29	25
30	32
31	29
32	33
33	34
34	35
35	36
36	38
37	31
38	40
39	42
40	44
41	37
42	46
43	41
44	39
45	49
46	45
47	43
48	50
49	51
50	52
51	54
52	57
53	47
54	48
55	60
56	63
57	65
58	56
59	53
60	68
61	55
62	62
63	58
64	74
65	66
66	64
67	59
68	75
69	76
70	78
71	61
72	82
73	67
74	86
75	70
76	72
77	92
78	95
79	69
80	98
81	85
82	80
83	71
84	102
85	84
86	94
87	88
88	111

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	26
26	27
27	28
28	30
29	25
30	32
31	29
32	33
33	34
34	35
35	36
36	38
37	31
38	40
39	42
40	44
41	37
42	46
43	41
44	39
45	49
46	45
47	43
48	50
49	51
50	52
51	54
52	57
53	47
54	48
55	60
56	63
57	65
58	56
59	53
60	68
61	55
62	62
63	58
64	74
65	66
66	64
67	59
68	75
69	76
70	78
71	61
72	82
73	67
74	86
75	70
76	72
77	92
78	95
79	69
80	98
81	85
82	80
83	71
84	102
85	84
86	94
87	88
88	111