A157721 - cp's OEIS frontend

A157721 a(n) = 0 if n is 1 or a prime, otherwise a(n) = product of composite (nonprime) divisors of n.

n	a(n)
1	0
2	0
3	0
4	4
5	0
6	6
7	0
8	32
9	9
10	10
11	0
12	288
13	0
14	14
15	15
16	512
17	0
18	972
19	0
20	800
21	21
22	22
23	0
24	55296
25	25
26	26
27	243
28	1568
29	0
30	27000
31	0
32	16384
33	33
34	34
35	35
36	1679616
37	0
38	38
39	39
40	256000
41	0
42	74088
43	0
44	3872
45	6075
46	46
47	0
48	42467328
49	49
50	12500
51	51
52	5408
53	0
54	1417176
55	55
56	702464
57	57
58	58
59	0

[0, 0, 0, 4, 0, 6, 0, 32, 9, 10, 0, 288, 0, 14, 15, 512, 0, 972, 0, 800, 21, 22, 0, 55296, 25, 26, 243, 1568, 0, 27000, 0, 16384, 33, 34, 35, 1679616, 0, 38, 39, 256000, 0, 74088, 0, 3872, 6075, 46, 0, 42467328, 49, 12500, 51, 5408, 0, 1417176, 55, 702464, 57, 58, 0]

cp's OEIS Frontend

A157721 a(n) = 0 if n is 1 or a prime, otherwise a(n) = product of composite (nonprime) divisors of n.

Table of values

List of values