A199767 - cp's OEIS frontend

A199767 Numbers m for which Sum_{i=1..k} (1+1/p_i) + Product_{i=1..k} (1+1/p_i) is an integer, where p_i are the k prime factors of m (with multiplicity).

n	a(n)
1	21
2	45
3	432
4	740
5	1728
6	3456
7	3888
8	5616
9	12096
10	23760
11	46656
12	52164
13	131328
14	152064
15	186624
16	195656
17	233280
18	311472
19	606528
20	618192
21	746496
22	926208
23	933120
24	979776
25	1273536
26	1403136
27	2985984
28	3221456
29	3732480
30	5178816
31	5412096
32	5971968
33	9704448
34	13651200

[21, 45, 432, 740, 1728, 3456, 3888, 5616, 12096, 23760, 46656, 52164, 131328, 152064, 186624, 195656, 233280, 311472, 606528, 618192, 746496, 926208, 933120, 979776, 1273536, 1403136, 2985984, 3221456, 3732480, 5178816, 5412096, 5971968, 9704448, 13651200]

cp's OEIS Frontend

A199767 Numbers m for which Sum_{i=1..k} (1+1/p_i) + Product_{i=1..k} (1+1/p_i) is an integer, where p_i are the k prime factors of m (with multiplicity).

Table of values

List of values