A255421 - cp's OEIS frontend

A255421 Permutation of natural numbers: a(1) = 1, a(p_n) = ludic(1+a(n)), a(c_n) = nonludic(a(n)), where p_n = n-th prime, c_n = n-th composite number and ludic = A003309, nonludic = A192607.

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	23
20	19
21	20
22	21
23	25
24	22
25	24
26	26
27	27
28	28
29	29
30	34
31	37
32	30
33	31
34	32
35	36
36	33
37	41
38	35
39	38
40	39
41	43
42	40
43	47
44	42
45	49
46	52
47	53
48	44
49	45
50	46
51	51
52	48
53	61
54	57
55	50
56	54
57	55
58	59
59	67
60	56
61	71
62	64
63	58
64	66
65	70
66	72
67	97
68	60
69	62
70	63
71	77
72	69
73	83
74	65
75	81

[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 23, 19, 20, 21, 25, 22, 24, 26, 27, 28, 29, 34, 37, 30, 31, 32, 36, 33, 41, 35, 38, 39, 43, 40, 47, 42, 49, 52, 53, 44, 45, 46, 51, 48, 61, 57, 50, 54, 55, 59, 67, 56, 71, 64, 58, 66, 70, 72, 97, 60, 62, 63, 77, 69, 83, 65, 81]

cp's OEIS Frontend

A255421 Permutation of natural numbers: a(1) = 1, a(p_n) = ludic(1+a(n)), a(c_n) = nonludic(a(n)), where p_n = n-th prime, c_n = n-th composite number and ludic = A003309, nonludic = A192607.

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	23
20	19
21	20
22	21
23	25
24	22
25	24
26	26
27	27
28	28
29	29
30	34
31	37
32	30
33	31
34	32
35	36
36	33
37	41
38	35
39	38
40	39
41	43
42	40
43	47
44	42
45	49
46	52
47	53
48	44
49	45
50	46
51	51
52	48
53	61
54	57
55	50
56	54
57	55
58	59
59	67
60	56
61	71
62	64
63	58
64	66
65	70
66	72
67	97
68	60
69	62
70	63
71	77
72	69
73	83
74	65
75	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	23
20	19
21	20
22	21
23	25
24	22
25	24
26	26
27	27
28	28
29	29
30	34
31	37
32	30
33	31
34	32
35	36
36	33
37	41
38	35
39	38
40	39
41	43
42	40
43	47
44	42
45	49
46	52
47	53
48	44
49	45
50	46
51	51
52	48
53	61
54	57
55	50
56	54
57	55
58	59
59	67
60	56
61	71
62	64
63	58
64	66
65	70
66	72
67	97
68	60
69	62
70	63
71	77
72	69
73	83
74	65
75	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	23
20	19
21	20
22	21
23	25
24	22
25	24
26	26
27	27
28	28
29	29
30	34
31	37
32	30
33	31
34	32
35	36
36	33
37	41
38	35
39	38
40	39
41	43
42	40
43	47
44	42
45	49
46	52
47	53
48	44
49	45
50	46
51	51
52	48
53	61
54	57
55	50
56	54
57	55
58	59
59	67
60	56
61	71
62	64
63	58
64	66
65	70
66	72
67	97
68	60
69	62
70	63
71	77
72	69
73	83
74	65
75	81