A308045 - cp's OEIS frontend

A308045 Numbers k such that usigma(k) = round(zeta(2)/zeta(3)*k), where usigma(k) is the sum of unitary divisors of k (A034448).

n	a(n)
1	1
2	2
3	3
4	4
5	35
6	44
7	111
8	123
9	1105
10	1900
11	2920
12	12452
13	17889
14	34200
15	65067
16	716148
17	14134055
18	179040201
19	221709100
20	221743300
21	221766100
22	221788900
23	1120968741
24	1272582040
25	1441454511
26	7339101375

[1, 2, 3, 4, 35, 44, 111, 123, 1105, 1900, 2920, 12452, 17889, 34200, 65067, 716148, 14134055, 179040201, 221709100, 221743300, 221766100, 221788900, 1120968741, 1272582040, 1441454511, 7339101375]

cp's OEIS Frontend

A308045 Numbers k such that usigma(k) = round(zeta(2)/zeta(3)*k), where usigma(k) is the sum of unitary divisors of k (A034448).

Table of values

List of values