A235201 - cp's OEIS frontend

A235201 Self-inverse and multiplicative permutation of integers: a(0)=0, a(1)=1, a(2)=2, a(3)=4 and a(4)=3, a(p_i) = p_{a(i)} for primes with index i > 2, and for composites > 4, a(u * v) = a(u) * a(v) for u, v > 0.

n	a(n)
0	0
1	1
2	2
3	4
4	3
5	7
6	8
7	5
8	6
9	16
10	14
11	17
12	12
13	19
14	10
15	28
16	9
17	11
18	32
19	13
20	21
21	20
22	34
23	53
24	24
25	49
26	38
27	64
28	15
29	43
30	56
31	59
32	18
33	68
34	22
35	35
36	48
37	37
38	26
39	76
40	42
41	67
42	40
43	29
44	51
45	112
46	106
47	107
48	36
49	25
50	98
51	44
52	57
53	23
54	128
55	119
56	30
57	52
58	86
59	31
60	84
61	131
62	118
63	80
64	27
65	133
66	136
67	41
68	33

[0, 1, 2, 4, 3, 7, 8, 5, 6, 16, 14, 17, 12, 19, 10, 28, 9, 11, 32, 13, 21, 20, 34, 53, 24, 49, 38, 64, 15, 43, 56, 59, 18, 68, 22, 35, 48, 37, 26, 76, 42, 67, 40, 29, 51, 112, 106, 107, 36, 25, 98, 44, 57, 23, 128, 119, 30, 52, 86, 31, 84, 131, 118, 80, 27, 133, 136, 41, 33]

cp's OEIS Frontend

A235201 Self-inverse and multiplicative permutation of integers: a(0)=0, a(1)=1, a(2)=2, a(3)=4 and a(4)=3, a(p_i) = p_{a(i)} for primes with index i > 2, and for composites > 4, a(u * v) = a(u) * a(v) for u, v > 0.

Table of values

List of values

n	a(n)
0	0
1	1
2	2
3	4
4	3
5	7
6	8
7	5
8	6
9	16
10	14
11	17
12	12
13	19
14	10
15	28
16	9
17	11
18	32
19	13
20	21
21	20
22	34
23	53
24	24
25	49
26	38
27	64
28	15
29	43
30	56
31	59
32	18
33	68
34	22
35	35
36	48
37	37
38	26
39	76
40	42
41	67
42	40
43	29
44	51
45	112
46	106
47	107
48	36
49	25
50	98
51	44
52	57
53	23
54	128
55	119
56	30
57	52
58	86
59	31
60	84
61	131
62	118
63	80
64	27
65	133
66	136
67	41
68	33

n	a(n)
0	0
1	1
2	2
3	4
4	3
5	7
6	8
7	5
8	6
9	16
10	14
11	17
12	12
13	19
14	10
15	28
16	9
17	11
18	32
19	13
20	21
21	20
22	34
23	53
24	24
25	49
26	38
27	64
28	15
29	43
30	56
31	59
32	18
33	68
34	22
35	35
36	48
37	37
38	26
39	76
40	42
41	67
42	40
43	29
44	51
45	112
46	106
47	107
48	36
49	25
50	98
51	44
52	57
53	23
54	128
55	119
56	30
57	52
58	86
59	31
60	84
61	131
62	118
63	80
64	27
65	133
66	136
67	41
68	33

n	a(n)
0	0
1	1
2	2
3	4
4	3
5	7
6	8
7	5
8	6
9	16
10	14
11	17
12	12
13	19
14	10
15	28
16	9
17	11
18	32
19	13
20	21
21	20
22	34
23	53
24	24
25	49
26	38
27	64
28	15
29	43
30	56
31	59
32	18
33	68
34	22
35	35
36	48
37	37
38	26
39	76
40	42
41	67
42	40
43	29
44	51
45	112
46	106
47	107
48	36
49	25
50	98
51	44
52	57
53	23
54	128
55	119
56	30
57	52
58	86
59	31
60	84
61	131
62	118
63	80
64	27
65	133
66	136
67	41
68	33