A230111 - cp's OEIS frontend

A230111 Composite numbers m such that Sum_{i=1..k} (p_i/(p_i+1)) - Product_{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	8
2	10
3	64
4	512
5	720
6	800
7	1320
8	1944
9	4096
10	5184
11	5760
12	6400
13	7200
14	8370
15	23520
16	32768
17	41472
18	44000
19	46080
20	47040
21	51200
22	69580
23	74088
24	76096
25	84672
26	93000
27	95040
28	105600
29	129360
30	235200
31	240000
32	262144
33	331776
34	368640
35	409600
36	518400
37	546480
38	576000
39	640000

[8, 10, 64, 512, 720, 800, 1320, 1944, 4096, 5184, 5760, 6400, 7200, 8370, 23520, 32768, 41472, 44000, 46080, 47040, 51200, 69580, 74088, 76096, 84672, 93000, 95040, 105600, 129360, 235200, 240000, 262144, 331776, 368640, 409600, 518400, 546480, 576000, 640000]

cp's OEIS Frontend

A230111 Composite numbers m such that Sum_{i=1..k} (p_i/(p_i+1)) - Product_{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