A230112 - cp's OEIS frontend

A230112 Composite numbers m 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 m (with multiplicity).

n	a(n)
1	4
2	8
3	16
4	64
5	256
6	720
7	800
8	2200
9	4096
10	25600
11	33600
12	36288
13	41472
14	46080
15	65536
16	92400
17	104960
18	235200
19	282240
20	338688
21	376320
22	403200
23	419840
24	535680
25	556640
26	576000
27	580800
28	640000
29	844800
30	979776
31	1088640
32	1244160
33	1354752
34	1382400
35	1505280
36	1689600
37	1995840

[4, 8, 16, 64, 256, 720, 800, 2200, 4096, 25600, 33600, 36288, 41472, 46080, 65536, 92400, 104960, 235200, 282240, 338688, 376320, 403200, 419840, 535680, 556640, 576000, 580800, 640000, 844800, 979776, 1088640, 1244160, 1354752, 1382400, 1505280, 1689600, 1995840]

cp's OEIS Frontend

A230112 Composite numbers m 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 m (with multiplicity).

Table of values

List of values