A257729 - cp's OEIS frontend

A257729 Permutation of natural numbers: a(1)=1; a(prime(n)) = oddprime(a(n)), a(composite(n)) = not_an_oddprime(1+a(n)).

n	a(n)
1	1
2	3
3	7
4	2
5	19
6	6
7	5
8	12
9	4
10	28
11	71
12	10
13	17
14	9
15	20
16	8
17	13
18	40
19	41
20	95
21	16
22	26
23	11
24	15
25	30
26	14
27	21
28	56
29	109
30	57
31	359
32	125
33	25
34	38
35	18
36	24
37	31
38	44
39	22
40	32
41	61
42	77
43	29
44	143
45	78
46	445
47	73
48	162
49	36
50	54
51	27
52	35
53	23
54	45
55	62
56	33
57	46
58	84
59	43
60	104
61	179
62	42
63	185
64	105
65	545
66	98
67	181
68	208
69	51
70	75
71	503
72	39
73	59
74	50
75	34
76	63
77	85
78	48
79	103
80	64
81	114
82	60
83	37

[1, 3, 7, 2, 19, 6, 5, 12, 4, 28, 71, 10, 17, 9, 20, 8, 13, 40, 41, 95, 16, 26, 11, 15, 30, 14, 21, 56, 109, 57, 359, 125, 25, 38, 18, 24, 31, 44, 22, 32, 61, 77, 29, 143, 78, 445, 73, 162, 36, 54, 27, 35, 23, 45, 62, 33, 46, 84, 43, 104, 179, 42, 185, 105, 545, 98, 181, 208, 51, 75, 503, 39, 59, 50, 34, 63, 85, 48, 103, 64, 114, 60, 37]

cp's OEIS Frontend

A257729 Permutation of natural numbers: a(1)=1; a(prime(n)) = oddprime(a(n)), a(composite(n)) = not_an_oddprime(1+a(n)).

Table of values

List of values

n	a(n)
1	1
2	3
3	7
4	2
5	19
6	6
7	5
8	12
9	4
10	28
11	71
12	10
13	17
14	9
15	20
16	8
17	13
18	40
19	41
20	95
21	16
22	26
23	11
24	15
25	30
26	14
27	21
28	56
29	109
30	57
31	359
32	125
33	25
34	38
35	18
36	24
37	31
38	44
39	22
40	32
41	61
42	77
43	29
44	143
45	78
46	445
47	73
48	162
49	36
50	54
51	27
52	35
53	23
54	45
55	62
56	33
57	46
58	84
59	43
60	104
61	179
62	42
63	185
64	105
65	545
66	98
67	181
68	208
69	51
70	75
71	503
72	39
73	59
74	50
75	34
76	63
77	85
78	48
79	103
80	64
81	114
82	60
83	37

n	a(n)
1	1
2	3
3	7
4	2
5	19
6	6
7	5
8	12
9	4
10	28
11	71
12	10
13	17
14	9
15	20
16	8
17	13
18	40
19	41
20	95
21	16
22	26
23	11
24	15
25	30
26	14
27	21
28	56
29	109
30	57
31	359
32	125
33	25
34	38
35	18
36	24
37	31
38	44
39	22
40	32
41	61
42	77
43	29
44	143
45	78
46	445
47	73
48	162
49	36
50	54
51	27
52	35
53	23
54	45
55	62
56	33
57	46
58	84
59	43
60	104
61	179
62	42
63	185
64	105
65	545
66	98
67	181
68	208
69	51
70	75
71	503
72	39
73	59
74	50
75	34
76	63
77	85
78	48
79	103
80	64
81	114
82	60
83	37

n	a(n)
1	1
2	3
3	7
4	2
5	19
6	6
7	5
8	12
9	4
10	28
11	71
12	10
13	17
14	9
15	20
16	8
17	13
18	40
19	41
20	95
21	16
22	26
23	11
24	15
25	30
26	14
27	21
28	56
29	109
30	57
31	359
32	125
33	25
34	38
35	18
36	24
37	31
38	44
39	22
40	32
41	61
42	77
43	29
44	143
45	78
46	445
47	73
48	162
49	36
50	54
51	27
52	35
53	23
54	45
55	62
56	33
57	46
58	84
59	43
60	104
61	179
62	42
63	185
64	105
65	545
66	98
67	181
68	208
69	51
70	75
71	503
72	39
73	59
74	50
75	34
76	63
77	85
78	48
79	103
80	64
81	114
82	60
83	37