A073675 - cp's OEIS frontend

A073675 Rearrangement of natural numbers such that a(n) is the smallest proper divisor of n not included earlier but if no such divisor exists then a(n) is the smallest proper multiple of n not included earlier, subject always to the condition that a(n) is not equal to n.

n	a(n)
1	2
2	1
3	6
4	8
5	10
6	3
7	14
8	4
9	18
10	5
11	22
12	24
13	26
14	7
15	30
16	32
17	34
18	9
19	38
20	40
21	42
22	11
23	46
24	12
25	50
26	13
27	54
28	56
29	58
30	15
31	62
32	16
33	66
34	17
35	70
36	72
37	74
38	19
39	78
40	20
41	82
42	21
43	86
44	88
45	90
46	23
47	94
48	96
49	98
50	25
51	102
52	104
53	106
54	27
55	110
56	28
57	114
58	29
59	118
60	120
61	122
62	31
63	126
64	128
65	130
66	33
67	134
68	136

[2, 1, 6, 8, 10, 3, 14, 4, 18, 5, 22, 24, 26, 7, 30, 32, 34, 9, 38, 40, 42, 11, 46, 12, 50, 13, 54, 56, 58, 15, 62, 16, 66, 17, 70, 72, 74, 19, 78, 20, 82, 21, 86, 88, 90, 23, 94, 96, 98, 25, 102, 104, 106, 27, 110, 28, 114, 29, 118, 120, 122, 31, 126, 128, 130, 33, 134, 136]

cp's OEIS Frontend

A073675 Rearrangement of natural numbers such that a(n) is the smallest proper divisor of n not included earlier but if no such divisor exists then a(n) is the smallest proper multiple of n not included earlier, subject always to the condition that a(n) is not equal to n.

Table of values

List of values

n	a(n)
1	2
2	1
3	6
4	8
5	10
6	3
7	14
8	4
9	18
10	5
11	22
12	24
13	26
14	7
15	30
16	32
17	34
18	9
19	38
20	40
21	42
22	11
23	46
24	12
25	50
26	13
27	54
28	56
29	58
30	15
31	62
32	16
33	66
34	17
35	70
36	72
37	74
38	19
39	78
40	20
41	82
42	21
43	86
44	88
45	90
46	23
47	94
48	96
49	98
50	25
51	102
52	104
53	106
54	27
55	110
56	28
57	114
58	29
59	118
60	120
61	122
62	31
63	126
64	128
65	130
66	33
67	134
68	136

n	a(n)
1	2
2	1
3	6
4	8
5	10
6	3
7	14
8	4
9	18
10	5
11	22
12	24
13	26
14	7
15	30
16	32
17	34
18	9
19	38
20	40
21	42
22	11
23	46
24	12
25	50
26	13
27	54
28	56
29	58
30	15
31	62
32	16
33	66
34	17
35	70
36	72
37	74
38	19
39	78
40	20
41	82
42	21
43	86
44	88
45	90
46	23
47	94
48	96
49	98
50	25
51	102
52	104
53	106
54	27
55	110
56	28
57	114
58	29
59	118
60	120
61	122
62	31
63	126
64	128
65	130
66	33
67	134
68	136

n	a(n)
1	2
2	1
3	6
4	8
5	10
6	3
7	14
8	4
9	18
10	5
11	22
12	24
13	26
14	7
15	30
16	32
17	34
18	9
19	38
20	40
21	42
22	11
23	46
24	12
25	50
26	13
27	54
28	56
29	58
30	15
31	62
32	16
33	66
34	17
35	70
36	72
37	74
38	19
39	78
40	20
41	82
42	21
43	86
44	88
45	90
46	23
47	94
48	96
49	98
50	25
51	102
52	104
53	106
54	27
55	110
56	28
57	114
58	29
59	118
60	120
61	122
62	31
63	126
64	128
65	130
66	33
67	134
68	136