A257730 - cp's OEIS frontend

A257730 Permutation of natural numbers: a(1)=1; a(oddprime(n)) = prime(a(n)), a(not_an_oddprime(n)) = composite(a(n-1)).

n	a(n)
1	1
2	4
3	2
4	9
5	7
6	6
7	3
8	16
9	14
10	12
11	23
12	8
13	17
14	26
15	24
16	21
17	13
18	35
19	5
20	15
21	27
22	39
23	53
24	36
25	33
26	22
27	51
28	10
29	43
30	25
31	37
32	40
33	56
34	75
35	52
36	49
37	83
38	34
39	72
40	18
41	19
42	62
43	59
44	38
45	54
46	57
47	101
48	78
49	102
50	74
51	69
52	114
53	89
54	50
55	98
56	28
57	30
58	86
59	73
60	82
61	41
62	55
63	76
64	80
65	134
66	106
67	149
68	135
69	100
70	94
71	11
72	150
73	47
74	120
75	70
76	130
77	42
78	45
79	103
80	117
81	99
82	112
83	167
84	58
85	77

[1, 4, 2, 9, 7, 6, 3, 16, 14, 12, 23, 8, 17, 26, 24, 21, 13, 35, 5, 15, 27, 39, 53, 36, 33, 22, 51, 10, 43, 25, 37, 40, 56, 75, 52, 49, 83, 34, 72, 18, 19, 62, 59, 38, 54, 57, 101, 78, 102, 74, 69, 114, 89, 50, 98, 28, 30, 86, 73, 82, 41, 55, 76, 80, 134, 106, 149, 135, 100, 94, 11, 150, 47, 120, 70, 130, 42, 45, 103, 117, 99, 112, 167, 58, 77]

cp's OEIS Frontend

A257730 Permutation of natural numbers: a(1)=1; a(oddprime(n)) = prime(a(n)), a(not_an_oddprime(n)) = composite(a(n-1)).

Table of values

List of values

n	a(n)
1	1
2	4
3	2
4	9
5	7
6	6
7	3
8	16
9	14
10	12
11	23
12	8
13	17
14	26
15	24
16	21
17	13
18	35
19	5
20	15
21	27
22	39
23	53
24	36
25	33
26	22
27	51
28	10
29	43
30	25
31	37
32	40
33	56
34	75
35	52
36	49
37	83
38	34
39	72
40	18
41	19
42	62
43	59
44	38
45	54
46	57
47	101
48	78
49	102
50	74
51	69
52	114
53	89
54	50
55	98
56	28
57	30
58	86
59	73
60	82
61	41
62	55
63	76
64	80
65	134
66	106
67	149
68	135
69	100
70	94
71	11
72	150
73	47
74	120
75	70
76	130
77	42
78	45
79	103
80	117
81	99
82	112
83	167
84	58
85	77

n	a(n)
1	1
2	4
3	2
4	9
5	7
6	6
7	3
8	16
9	14
10	12
11	23
12	8
13	17
14	26
15	24
16	21
17	13
18	35
19	5
20	15
21	27
22	39
23	53
24	36
25	33
26	22
27	51
28	10
29	43
30	25
31	37
32	40
33	56
34	75
35	52
36	49
37	83
38	34
39	72
40	18
41	19
42	62
43	59
44	38
45	54
46	57
47	101
48	78
49	102
50	74
51	69
52	114
53	89
54	50
55	98
56	28
57	30
58	86
59	73
60	82
61	41
62	55
63	76
64	80
65	134
66	106
67	149
68	135
69	100
70	94
71	11
72	150
73	47
74	120
75	70
76	130
77	42
78	45
79	103
80	117
81	99
82	112
83	167
84	58
85	77

n	a(n)
1	1
2	4
3	2
4	9
5	7
6	6
7	3
8	16
9	14
10	12
11	23
12	8
13	17
14	26
15	24
16	21
17	13
18	35
19	5
20	15
21	27
22	39
23	53
24	36
25	33
26	22
27	51
28	10
29	43
30	25
31	37
32	40
33	56
34	75
35	52
36	49
37	83
38	34
39	72
40	18
41	19
42	62
43	59
44	38
45	54
46	57
47	101
48	78
49	102
50	74
51	69
52	114
53	89
54	50
55	98
56	28
57	30
58	86
59	73
60	82
61	41
62	55
63	76
64	80
65	134
66	106
67	149
68	135
69	100
70	94
71	11
72	150
73	47
74	120
75	70
76	130
77	42
78	45
79	103
80	117
81	99
82	112
83	167
84	58
85	77