login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A001225
as a simple table
n
a(n)
2
1
3
2
4
5
5
7
6
11
7
14
8
20
9
24
10
30
11
35
12
44
13
50
[1,2,5,7,11,14,20,24,30,35,44,50]