A162657 - cp's OEIS frontend

A162657 Least number m such that n is the denominator of sigma_{-1}(m), or zero if no such exists.

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	18
7	7
8	8
9	9
10	20
11	11
12	48
13	13
14	112
15	45
16	16
17	17
18	468
19	19
20	480
21	21
22	88
23	23
24	72
25	25
26	52
27	27
28	196
29	29
30	180
31	31
32	32
33	99
34	68
35	35
36	36
37	37
38	152
39	39
40	80
41	41
42	1344
43	43
44	176
45	810
46	368
47	47
48	192
49	49
50	50
51	459
52	104
53	53
54	162
55	55
56	448
57	57
58	116
59	59
60	9360
61	61
62	1984
63	63
64	64
65	65

[1, 2, 3, 4, 5, 18, 7, 8, 9, 20, 11, 48, 13, 112, 45, 16, 17, 468, 19, 480, 21, 88, 23, 72, 25, 52, 27, 196, 29, 180, 31, 32, 99, 68, 35, 36, 37, 152, 39, 80, 41, 1344, 43, 176, 810, 368, 47, 192, 49, 50, 459, 104, 53, 162, 55, 448, 57, 116, 59, 9360, 61, 1984, 63, 64, 65]

cp's OEIS Frontend

A162657 Least number m such that n is the denominator of sigma_{-1}(m), or zero if no such exists.

Table of values

List of values