A255422 - cp's OEIS frontend

A255422 Permutation of natural numbers: a(1) = 1 and for n > 1, if n is k-th ludic number larger than 1 [i.e., n = A003309(k+1)], a(n) = nthprime(a(k)), otherwise, when n is k-th nonludic number [i.e., n = A192607(k)], a(n) = nthcomposite(a(k)), where nthcomposite = A002808, nthprime = A000040.

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	20
20	21
21	22
22	24
23	19
24	25
25	23
26	26
27	27
28	28
29	29
30	32
31	33
32	34
33	36
34	30
35	38
36	35
37	31
38	39
39	40
40	42
41	37
42	44
43	41
44	48
45	49
46	50
47	43
48	52
49	45
50	55
51	51
52	46
53	47
54	56
55	57
56	60
57	54
58	63
59	58
60	68
61	53
62	69
63	70
64	62
65	74
66	64
67	59
68	77
69	72
70	65
71	61
72	66
73	78
74	80
75	84
76	76
77	71
78	87
79	81

[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20, 21, 22, 24, 19, 25, 23, 26, 27, 28, 29, 32, 33, 34, 36, 30, 38, 35, 31, 39, 40, 42, 37, 44, 41, 48, 49, 50, 43, 52, 45, 55, 51, 46, 47, 56, 57, 60, 54, 63, 58, 68, 53, 69, 70, 62, 74, 64, 59, 77, 72, 65, 61, 66, 78, 80, 84, 76, 71, 87, 81]

cp's OEIS Frontend

A255422 Permutation of natural numbers: a(1) = 1 and for n > 1, if n is k-th ludic number larger than 1 [i.e., n = A003309(k+1)], a(n) = nthprime(a(k)), otherwise, when n is k-th nonludic number [i.e., n = A192607(k)], a(n) = nthcomposite(a(k)), where nthcomposite = A002808, nthprime = A000040.

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	20
20	21
21	22
22	24
23	19
24	25
25	23
26	26
27	27
28	28
29	29
30	32
31	33
32	34
33	36
34	30
35	38
36	35
37	31
38	39
39	40
40	42
41	37
42	44
43	41
44	48
45	49
46	50
47	43
48	52
49	45
50	55
51	51
52	46
53	47
54	56
55	57
56	60
57	54
58	63
59	58
60	68
61	53
62	69
63	70
64	62
65	74
66	64
67	59
68	77
69	72
70	65
71	61
72	66
73	78
74	80
75	84
76	76
77	71
78	87
79	81

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	20
20	21
21	22
22	24
23	19
24	25
25	23
26	26
27	27
28	28
29	29
30	32
31	33
32	34
33	36
34	30
35	38
36	35
37	31
38	39
39	40
40	42
41	37
42	44
43	41
44	48
45	49
46	50
47	43
48	52
49	45
50	55
51	51
52	46
53	47
54	56
55	57
56	60
57	54
58	63
59	58
60	68
61	53
62	69
63	70
64	62
65	74
66	64
67	59
68	77
69	72
70	65
71	61
72	66
73	78
74	80
75	84
76	76
77	71
78	87
79	81

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	20
20	21
21	22
22	24
23	19
24	25
25	23
26	26
27	27
28	28
29	29
30	32
31	33
32	34
33	36
34	30
35	38
36	35
37	31
38	39
39	40
40	42
41	37
42	44
43	41
44	48
45	49
46	50
47	43
48	52
49	45
50	55
51	51
52	46
53	47
54	56
55	57
56	60
57	54
58	63
59	58
60	68
61	53
62	69
63	70
64	62
65	74
66	64
67	59
68	77
69	72
70	65
71	61
72	66
73	78
74	80
75	84
76	76
77	71
78	87
79	81