login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A087578
as a simple table
n
a(n)
1
3
2
7
3
13
4
31
5
127
6
307
7
1093
8
1723
9
2801
10
3541
11
5113
12
8011
13
8191
14
10303
15
17293
16
19531
[3,7,13,31,127,307,1093,1723,2801,3541,5113,8011, 8191,10303,17293,19531]