A072181 - cp's OEIS frontend

A072181 a(1) = 1; for n >= 2, suppose a(n-1) = Product p_i^e_i and n = Product p_i^f_i, then a(n) = Product p_i^(e_i*f_i).

n	a(n)
1	1
2	2
3	6
4	12
5	60
6	60
7	420
8	6720
9	20160
10	20160
11	221760
12	14192640
13	184504320
14	184504320
15	184504320
16	12679040325931499520
17	215543685540835491840
18	1939893169867519426560
19	36857970227482869104640

[1, 2, 6, 12, 60, 60, 420, 6720, 20160, 20160, 221760, 14192640, 184504320, 184504320, 184504320, 12679040325931499520, 215543685540835491840, 1939893169867519426560, 36857970227482869104640]

cp's OEIS Frontend

A072181 a(1) = 1; for n >= 2, suppose a(n-1) = Product p_i^e_i and n = Product p_i^f_i, then a(n) = Product p_i^(e_i*f_i).

Table of values

List of values