A230110 - cp's OEIS frontend

A230110 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	30
4	63
5	64
6	512
7	588
8	720
9	800
10	1320
11	3960
12	4096
13	5184
14	5760
15	6400
16	7200
17	21600
18	27720
19	27900
20	32768
21	35280
22	41472
23	46080
24	51200
25	70840
26	84672
27	92400
28	95040
29	105600
30	151200
31	188160
32	262144
33	331776
34	368640
35	376320
36	409600
37	504000
38	518400
39	576000
40	640000

[8, 10, 30, 63, 64, 512, 588, 720, 800, 1320, 3960, 4096, 5184, 5760, 6400, 7200, 21600, 27720, 27900, 32768, 35280, 41472, 46080, 51200, 70840, 84672, 92400, 95040, 105600, 151200, 188160, 262144, 331776, 368640, 376320, 409600, 504000, 518400, 576000, 640000]

cp's OEIS Frontend

A230110 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