A361970 - cp's OEIS frontend

A361970 a(n) is the least number k such that the equation uphi(x) = k has exactly n solutions, or -1 if no such k exists, where uphi is the unitary totient function (A047994).

n	a(n)
0	5
1	1
2	2
3	6
4	8
5	12
6	36
7	156
8	24
9	552
10	168
11	48
12	96
13	420
14	120
15	192
16	3264
17	144
18	384
19	336
20	1536
21	288
22	360
23	240
24	672
25	1200
26	3888
27	1080
28	4896
29	1584
30	480
31	576
32	7056
33	4992
34	864
35	1872
36	1152
37	3120
38	960
39	2400
40	720
41	2520
42	30960
43	2688
44	19968
45	1680
46	1728
47	1920
48	2016
49	2304
50	12000

[5, 1, 2, 6, 8, 12, 36, 156, 24, 552, 168, 48, 96, 420, 120, 192, 3264, 144, 384, 336, 1536, 288, 360, 240, 672, 1200, 3888, 1080, 4896, 1584, 480, 576, 7056, 4992, 864, 1872, 1152, 3120, 960, 2400, 720, 2520, 30960, 2688, 19968, 1680, 1728, 1920, 2016, 2304, 12000]

cp's OEIS Frontend

A361970 a(n) is the least number k such that the equation uphi(x) = k has exactly n solutions, or -1 if no such k exists, where uphi is the unitary totient function (A047994).

Table of values

List of values