A238922 - cp's OEIS frontend

A238922 Numbers n such that Sum_{i=1..j} 1/d(i) - Sum_{i=1..k} 1/p(i) is an integer, where p are the prime factors of n, counted with multiplicity, and d its divisors.

n	a(n)
1	1
2	12
3	18
4	220
5	396
6	17296
7	24016
8	287532
9	4661056
10	64288512
11	334144656
12	358585488
13	555192576
14	568719616
15	2172649216
16	2451538112
17	2645953344
18	2955423888
19	6704333824
20	26996772032
21	88734733632
22	147861504000
23	311063879024
24	371226582848
25	429391876096

[1, 12, 18, 220, 396, 17296, 24016, 287532, 4661056, 64288512, 334144656, 358585488, 555192576, 568719616, 2172649216, 2451538112, 2645953344, 2955423888, 6704333824, 26996772032, 88734733632, 147861504000, 311063879024, 371226582848, 429391876096]

cp's OEIS Frontend

A238922 Numbers n such that Sum_{i=1..j} 1/d(i) - Sum_{i=1..k} 1/p(i) is an integer, where p are the prime factors of n, counted with multiplicity, and d its divisors.

Table of values

List of values