A167401 - cp's OEIS frontend

A167401 a(n) is the smallest number k such that n*k has twice as many divisors as k.

n	a(n)
2	1
3	1
4	2
5	1
6	12
7	1
8	4
9	3
10	20
11	1
12	72
13	1
14	28
15	45
16	8
17	1
18	108
19	1
20	160
21	63
22	44
23	1
24	288
25	5
26	52
27	9
28	224
29	1
30	10800
31	1
32	16
33	99
34	68
35	175
36	864
37	1
38	76
39	117
40	800
41	1
42	21168
43	1
44	352
45	675
46	92
47	1
48	1152
49	7
50	400
51	153
52	416
53	1
54	648
55	275
56	1568
57	171
58	116
59	1
60	259200

[1, 1, 2, 1, 12, 1, 4, 3, 20, 1, 72, 1, 28, 45, 8, 1, 108, 1, 160, 63, 44, 1, 288, 5, 52, 9, 224, 1, 10800, 1, 16, 99, 68, 175, 864, 1, 76, 117, 800, 1, 21168, 1, 352, 675, 92, 1, 1152, 7, 400, 153, 416, 1, 648, 275, 1568, 171, 116, 1, 259200]

cp's OEIS Frontend

A167401 a(n) is the smallest number k such that n*k has twice as many divisors as k.

Table of values

List of values