A128555 - cp's OEIS frontend

A128555 a(n) = the smallest positive multiple of d(n) that does not occur earlier in the sequence, where d(n) is the number of positive divisors of n.

n	a(n)
1	1
2	2
3	4
4	3
5	6
6	8
7	10
8	12
9	9
10	16
11	14
12	18
13	20
14	24
15	28
16	5
17	22
18	30
19	26
20	36
21	32
22	40
23	34
24	48
25	15
26	44
27	52
28	42
29	38
30	56
31	46
32	54
33	60
34	64
35	68
36	27
37	50
38	72
39	76
40	80
41	58
42	88
43	62
44	66
45	78
46	84
47	70
48	90
49	21
50	96
51	92
52	102
53	74
54	104
55	100
56	112
57	108
58	116
59	82
60	120
61	86
62	124
63	114
64	7
65	128
66	136
67	94
68	126

[1, 2, 4, 3, 6, 8, 10, 12, 9, 16, 14, 18, 20, 24, 28, 5, 22, 30, 26, 36, 32, 40, 34, 48, 15, 44, 52, 42, 38, 56, 46, 54, 60, 64, 68, 27, 50, 72, 76, 80, 58, 88, 62, 66, 78, 84, 70, 90, 21, 96, 92, 102, 74, 104, 100, 112, 108, 116, 82, 120, 86, 124, 114, 7, 128, 136, 94, 126]

cp's OEIS Frontend

A128555 a(n) = the smallest positive multiple of d(n) that does not occur earlier in the sequence, where d(n) is the number of positive divisors of n.

Table of values

List of values

n	a(n)
1	1
2	2
3	4
4	3
5	6
6	8
7	10
8	12
9	9
10	16
11	14
12	18
13	20
14	24
15	28
16	5
17	22
18	30
19	26
20	36
21	32
22	40
23	34
24	48
25	15
26	44
27	52
28	42
29	38
30	56
31	46
32	54
33	60
34	64
35	68
36	27
37	50
38	72
39	76
40	80
41	58
42	88
43	62
44	66
45	78
46	84
47	70
48	90
49	21
50	96
51	92
52	102
53	74
54	104
55	100
56	112
57	108
58	116
59	82
60	120
61	86
62	124
63	114
64	7
65	128
66	136
67	94
68	126

n	a(n)
1	1
2	2
3	4
4	3
5	6
6	8
7	10
8	12
9	9
10	16
11	14
12	18
13	20
14	24
15	28
16	5
17	22
18	30
19	26
20	36
21	32
22	40
23	34
24	48
25	15
26	44
27	52
28	42
29	38
30	56
31	46
32	54
33	60
34	64
35	68
36	27
37	50
38	72
39	76
40	80
41	58
42	88
43	62
44	66
45	78
46	84
47	70
48	90
49	21
50	96
51	92
52	102
53	74
54	104
55	100
56	112
57	108
58	116
59	82
60	120
61	86
62	124
63	114
64	7
65	128
66	136
67	94
68	126

n	a(n)
1	1
2	2
3	4
4	3
5	6
6	8
7	10
8	12
9	9
10	16
11	14
12	18
13	20
14	24
15	28
16	5
17	22
18	30
19	26
20	36
21	32
22	40
23	34
24	48
25	15
26	44
27	52
28	42
29	38
30	56
31	46
32	54
33	60
34	64
35	68
36	27
37	50
38	72
39	76
40	80
41	58
42	88
43	62
44	66
45	78
46	84
47	70
48	90
49	21
50	96
51	92
52	102
53	74
54	104
55	100
56	112
57	108
58	116
59	82
60	120
61	86
62	124
63	114
64	7
65	128
66	136
67	94
68	126