A118455 - cp's OEIS frontend

A118455 a(1)=1, a(n) = Product_{k=2..n} P(k), where P(k) is the largest prime <= k.

n	a(n)
1	1
2	2
3	6
4	18
5	90
6	450
7	3150
8	22050
9	154350
10	1080450
11	11884950
12	130734450
13	1699547850
14	22094122050
15	287223586650
16	3733906626450
17	63476412649650
18	1079099015044050
19	20502881285836950
20	389554744430902050

[1, 2, 6, 18, 90, 450, 3150, 22050, 154350, 1080450, 11884950, 130734450, 1699547850, 22094122050, 287223586650, 3733906626450, 63476412649650, 1079099015044050, 20502881285836950, 389554744430902050]

cp's OEIS Frontend

A118455 a(1)=1, a(n) = Product_{k=2..n} P(k), where P(k) is the largest prime <= k.

Table of values

List of values