A227034 - cp's OEIS frontend

A227034 Composite numbers such that product_{i=1..k} (p_i/(p_i-1)) / sum_{i=1..k} (p_i/(p_i-1)) is an integer, where p_i are the k prime factors of n (with multiplicity).

n	a(n)
1	4
2	16
3	72
4	132
5	256
6	800
7	1232
8	2208
9	2960
10	5184
11	5376
12	11904
13	19200
14	23760
15	39040
16	41472
17	65536
18	72000
19	76032
20	76800
21	84816
22	203280
23	259200
24	288768
25	332928
26	345600
27	373248
28	383040
29	416000
30	614400
31	628992
32	640000
33	663552
34	691200
35	1228800
36	1996800
37	2013312

[4, 16, 72, 132, 256, 800, 1232, 2208, 2960, 5184, 5376, 11904, 19200, 23760, 39040, 41472, 65536, 72000, 76032, 76800, 84816, 203280, 259200, 288768, 332928, 345600, 373248, 383040, 416000, 614400, 628992, 640000, 663552, 691200, 1228800, 1996800, 2013312]

cp's OEIS Frontend

A227034 Composite numbers such that product_{i=1..k} (p_i/(p_i-1)) / sum_{i=1..k} (p_i/(p_i-1)) is an integer, where p_i are the k prime factors of n (with multiplicity).

Table of values

List of values