A235487 - cp's OEIS frontend

A235487 Self-inverse and multiplicative permutation of integers: For n < 7, a(n)=n, a(7)=8 and a(8)=7, a(p_i) = p_{a(i)} for primes with index i <> 4, and for composites > 8, a(uv) = a(u) a(v).

n	a(n)
0	0
1	1
2	2
3	3
4	4
5	5
6	6
7	8
8	7
9	9
10	10
11	11
12	12
13	13
14	16
15	15
16	14
17	19
18	18
19	17
20	20
21	24
22	22
23	23
24	21
25	25
26	26
27	27
28	32
29	29
30	30
31	31
32	28
33	33
34	38
35	40
36	36
37	37
38	34
39	39
40	35
41	41
42	48
43	53
44	44
45	45
46	46
47	47
48	42
49	64
50	50
51	57
52	52
53	43
54	54
55	55
56	56
57	51
58	58
59	67
60	60
61	61
62	62
63	72
64	49
65	65
66	66
67	59
68	76
69	69
70	80
71	71
72	63
73	89
74	74
75	75
76	68
77	88
78	78
79	79
80	70
81	81

[0, 1, 2, 3, 4, 5, 6, 8, 7, 9, 10, 11, 12, 13, 16, 15, 14, 19, 18, 17, 20, 24, 22, 23, 21, 25, 26, 27, 32, 29, 30, 31, 28, 33, 38, 40, 36, 37, 34, 39, 35, 41, 48, 53, 44, 45, 46, 47, 42, 64, 50, 57, 52, 43, 54, 55, 56, 51, 58, 67, 60, 61, 62, 72, 49, 65, 66, 59, 76, 69, 80, 71, 63, 89, 74, 75, 68, 88, 78, 79, 70, 81]

cp's OEIS Frontend

A235487 Self-inverse and multiplicative permutation of integers: For n < 7, a(n)=n, a(7)=8 and a(8)=7, a(p_i) = p_{a(i)} for primes with index i <> 4, and for composites > 8, a(uv) = a(u) a(v).

Table of values

List of values

n	a(n)
0	0
1	1
2	2
3	3
4	4
5	5
6	6
7	8
8	7
9	9
10	10
11	11
12	12
13	13
14	16
15	15
16	14
17	19
18	18
19	17
20	20
21	24
22	22
23	23
24	21
25	25
26	26
27	27
28	32
29	29
30	30
31	31
32	28
33	33
34	38
35	40
36	36
37	37
38	34
39	39
40	35
41	41
42	48
43	53
44	44
45	45
46	46
47	47
48	42
49	64
50	50
51	57
52	52
53	43
54	54
55	55
56	56
57	51
58	58
59	67
60	60
61	61
62	62
63	72
64	49
65	65
66	66
67	59
68	76
69	69
70	80
71	71
72	63
73	89
74	74
75	75
76	68
77	88
78	78
79	79
80	70
81	81

n	a(n)
0	0
1	1
2	2
3	3
4	4
5	5
6	6
7	8
8	7
9	9
10	10
11	11
12	12
13	13
14	16
15	15
16	14
17	19
18	18
19	17
20	20
21	24
22	22
23	23
24	21
25	25
26	26
27	27
28	32
29	29
30	30
31	31
32	28
33	33
34	38
35	40
36	36
37	37
38	34
39	39
40	35
41	41
42	48
43	53
44	44
45	45
46	46
47	47
48	42
49	64
50	50
51	57
52	52
53	43
54	54
55	55
56	56
57	51
58	58
59	67
60	60
61	61
62	62
63	72
64	49
65	65
66	66
67	59
68	76
69	69
70	80
71	71
72	63
73	89
74	74
75	75
76	68
77	88
78	78
79	79
80	70
81	81

cp's OEIS Frontend

A235487 Self-inverse and multiplicative permutation of integers: For n < 7, a(n)=n, a(7)=8 and a(8)=7, a(p_i) = p_{a(i)} for primes with index i <> 4, and for composites > 8, a(u*v) = a(u) * a(v).

Table of values

List of values

A235487 Self-inverse and multiplicative permutation of integers: For n < 7, a(n)=n, a(7)=8 and a(8)=7, a(p_i) = p_{a(i)} for primes with index i <> 4, and for composites > 8, a(uv) = a(u) a(v).

n	a(n)
0	0
1	1
2	2
3	3
4	4
5	5
6	6
7	8
8	7
9	9
10	10
11	11
12	12
13	13
14	16
15	15
16	14
17	19
18	18
19	17
20	20
21	24
22	22
23	23
24	21
25	25
26	26
27	27
28	32
29	29
30	30
31	31
32	28
33	33
34	38
35	40
36	36
37	37
38	34
39	39
40	35
41	41
42	48
43	53
44	44
45	45
46	46
47	47
48	42
49	64
50	50
51	57
52	52
53	43
54	54
55	55
56	56
57	51
58	58
59	67
60	60
61	61
62	62
63	72
64	49
65	65
66	66
67	59
68	76
69	69
70	80
71	71
72	63
73	89
74	74
75	75
76	68
77	88
78	78
79	79
80	70
81	81