A257732 - cp's OEIS frontend

A257732 Permutation of natural numbers: a(1) = 1, a(lucky(n)) = prime(a(n-1)), a(unlucky(n)) = composite(a(n)), where lucky(n) = n-th lucky number A000959, unlucky(n) = n-th unlucky number A050505, and prime = A000040, composite = A002808.

n	a(n)
1	1
2	4
3	2
4	9
5	6
6	16
7	7
8	12
9	3
10	26
11	14
12	21
13	23
14	8
15	13
16	39
17	24
18	33
19	35
20	15
21	53
22	22
23	56
24	36
25	17
26	49
27	51
28	25
29	75
30	34
31	37
32	78
33	5
34	52
35	27
36	69
37	101
38	72
39	38
40	102
41	50
42	54
43	43
44	106
45	10
46	74
47	40
48	94
49	73
50	134
51	83
52	98
53	55
54	135
55	70
56	76
57	62
58	141
59	18
60	100
61	57
62	125
63	19
64	99
65	175
66	114
67	41
68	130
69	167
70	77
71	176
72	95
73	89
74	104
75	137
76	86
77	184
78	28
79	149
80	133
81	80
82	164
83	30

[1, 4, 2, 9, 6, 16, 7, 12, 3, 26, 14, 21, 23, 8, 13, 39, 24, 33, 35, 15, 53, 22, 56, 36, 17, 49, 51, 25, 75, 34, 37, 78, 5, 52, 27, 69, 101, 72, 38, 102, 50, 54, 43, 106, 10, 74, 40, 94, 73, 134, 83, 98, 55, 135, 70, 76, 62, 141, 18, 100, 57, 125, 19, 99, 175, 114, 41, 130, 167, 77, 176, 95, 89, 104, 137, 86, 184, 28, 149, 133, 80, 164, 30]

cp's OEIS Frontend

A257732 Permutation of natural numbers: a(1) = 1, a(lucky(n)) = prime(a(n-1)), a(unlucky(n)) = composite(a(n)), where lucky(n) = n-th lucky number A000959, unlucky(n) = n-th unlucky number A050505, and prime = A000040, composite = A002808.

Table of values

List of values

n	a(n)
1	1
2	4
3	2
4	9
5	6
6	16
7	7
8	12
9	3
10	26
11	14
12	21
13	23
14	8
15	13
16	39
17	24
18	33
19	35
20	15
21	53
22	22
23	56
24	36
25	17
26	49
27	51
28	25
29	75
30	34
31	37
32	78
33	5
34	52
35	27
36	69
37	101
38	72
39	38
40	102
41	50
42	54
43	43
44	106
45	10
46	74
47	40
48	94
49	73
50	134
51	83
52	98
53	55
54	135
55	70
56	76
57	62
58	141
59	18
60	100
61	57
62	125
63	19
64	99
65	175
66	114
67	41
68	130
69	167
70	77
71	176
72	95
73	89
74	104
75	137
76	86
77	184
78	28
79	149
80	133
81	80
82	164
83	30

n	a(n)
1	1
2	4
3	2
4	9
5	6
6	16
7	7
8	12
9	3
10	26
11	14
12	21
13	23
14	8
15	13
16	39
17	24
18	33
19	35
20	15
21	53
22	22
23	56
24	36
25	17
26	49
27	51
28	25
29	75
30	34
31	37
32	78
33	5
34	52
35	27
36	69
37	101
38	72
39	38
40	102
41	50
42	54
43	43
44	106
45	10
46	74
47	40
48	94
49	73
50	134
51	83
52	98
53	55
54	135
55	70
56	76
57	62
58	141
59	18
60	100
61	57
62	125
63	19
64	99
65	175
66	114
67	41
68	130
69	167
70	77
71	176
72	95
73	89
74	104
75	137
76	86
77	184
78	28
79	149
80	133
81	80
82	164
83	30

n	a(n)
1	1
2	4
3	2
4	9
5	6
6	16
7	7
8	12
9	3
10	26
11	14
12	21
13	23
14	8
15	13
16	39
17	24
18	33
19	35
20	15
21	53
22	22
23	56
24	36
25	17
26	49
27	51
28	25
29	75
30	34
31	37
32	78
33	5
34	52
35	27
36	69
37	101
38	72
39	38
40	102
41	50
42	54
43	43
44	106
45	10
46	74
47	40
48	94
49	73
50	134
51	83
52	98
53	55
54	135
55	70
56	76
57	62
58	141
59	18
60	100
61	57
62	125
63	19
64	99
65	175
66	114
67	41
68	130
69	167
70	77
71	176
72	95
73	89
74	104
75	137
76	86
77	184
78	28
79	149
80	133
81	80
82	164
83	30