A145680 - cp's OEIS frontend

A145680 a(n) = smallest number m such that UnitarySigma(m) = nm/(n-1).

n	a(n)
2	6
3	2
4	3
5	4
6	5
7	216
8	7
9	8
10	9
11	5292000
12	11
13	10584000
14	13
15	4991499040640000
16	165375
17	16
18	17
19	235270656
20	19
21	101867327360000
22	8107610881081625211441398582431641600000
23	19235716742537891017605454376709022095843377283072000000
24	23
25	552063590295800832
26	25

[6, 2, 3, 4, 5, 216, 7, 8, 9, 5292000, 11, 10584000, 13, 4991499040640000, 165375, 16, 17, 235270656, 19, 101867327360000, 8107610881081625211441398582431641600000, 19235716742537891017605454376709022095843377283072000000, 23, 552063590295800832, 25]

cp's OEIS Frontend

A145680 a(n) = smallest number m such that UnitarySigma(m) = nm/(n-1).

Table of values

List of values