A140644 - cp's OEIS frontend

A140644 a(0)=1. a(n) = a(n-1)/d(n) if d(n) divides a(n-1). Otherwise, a(n) = a(n-1)*d(n). (d(n) is the number of positive divisors of n.).

n	a(n)
0	1
1	1
2	2
3	1
4	3
5	6
6	24
7	12
8	3
9	1
10	4
11	2
12	12
13	6
14	24
15	6
16	30
17	15
18	90
19	45
20	270
21	1080
22	270
23	135
24	1080
25	360
26	90
27	360
28	60
29	30
30	240
31	120
32	20
33	5
34	20
35	5
36	45
37	90
38	360
39	90
40	720
41	360
42	45
43	90
44	15
45	90
46	360
47	180
48	18
49	6
50	1
51	4
52	24
53	12
54	96
55	24
56	3
57	12
58	3
59	6
60	72
61	36
62	9
63	54
64	378
65	1512
66	189
67	378
68	63

[1, 1, 2, 1, 3, 6, 24, 12, 3, 1, 4, 2, 12, 6, 24, 6, 30, 15, 90, 45, 270, 1080, 270, 135, 1080, 360, 90, 360, 60, 30, 240, 120, 20, 5, 20, 5, 45, 90, 360, 90, 720, 360, 45, 90, 15, 90, 360, 180, 18, 6, 1, 4, 24, 12, 96, 24, 3, 12, 3, 6, 72, 36, 9, 54, 378, 1512, 189, 378, 63]

cp's OEIS Frontend

A140644 a(0)=1. a(n) = a(n-1)/d(n) if d(n) divides a(n-1). Otherwise, a(n) = a(n-1)*d(n). (d(n) is the number of positive divisors of n.).

Table of values

List of values