login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A020490
as a simple table
n
a(n)
1
1
2
2
3
3
4
4
5
6
6
8
7
10
8
12
9
18
10
24
11
30
[1,2,3,4,6,8,10,12,18,24,30]