A291051 - cp's OEIS frontend

A291051 a(n) is the smallest number k such that psi(k) = n*phi(k) where psi(k) is Dedekind psi function (A001615) and phi(k) is Euler totient function (A000010), or 0 if no such k exists.

n	a(n)
1	1
2	3
3	2
4	14
5	190
6	6
7	78
8	42
9	30
10	570
11	16770
12	210
13	1102290
14	2730
15	67830
16	43890
17	133707210
18	746130
19	27606810
20	16546530
21	9699690
22	417086670
23	3828438543930
24	8720021310
25	705196562070

[1, 3, 2, 14, 190, 6, 78, 42, 30, 570, 16770, 210, 1102290, 2730, 67830, 43890, 133707210, 746130, 27606810, 16546530, 9699690, 417086670, 3828438543930, 8720021310, 705196562070]

cp's OEIS Frontend

A291051 a(n) is the smallest number k such that psi(k) = n*phi(k) where psi(k) is Dedekind psi function (A001615) and phi(k) is Euler totient function (A000010), or 0 if no such k exists.

Table of values

List of values