A325022 - cp's OEIS frontend

A325022 Harmonic numbers m from A001599 such that m*(m-tau(m))/sigma(m) is not an integer, where k-tau(k) = the number of nondivisors of k (A049820), tau(k) = the number of divisors of k (A000005) and sigma(k) = the sum of the divisors of k (A000203).

n	a(n)
1	140
2	270
3	1638
4	2970
5	6200
6	8190
7	18600
8	18620
9	27846
10	55860
11	105664
12	117800
13	167400
14	173600
15	237510
16	242060
17	360360
18	539400
19	726180
20	753480
21	950976
22	1089270
23	1421280
24	1539720
25	2229500
26	2290260
27	2457000
28	2845800
29	4358600
30	4713984
31	4754880
32	5772200
33	6051500

[140, 270, 1638, 2970, 6200, 8190, 18600, 18620, 27846, 55860, 105664, 117800, 167400, 173600, 237510, 242060, 360360, 539400, 726180, 753480, 950976, 1089270, 1421280, 1539720, 2229500, 2290260, 2457000, 2845800, 4358600, 4713984, 4754880, 5772200, 6051500]

cp's OEIS Frontend

A325022 Harmonic numbers m from A001599 such that m*(m-tau(m))/sigma(m) is not an integer, where k-tau(k) = the number of nondivisors of k (A049820), tau(k) = the number of divisors of k (A000005) and sigma(k) = the sum of the divisors of k (A000203).

Table of values

List of values