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A053647
as a simple table
n
a(n)
1
2
2
5
3
7
4
13
5
37
6
73
7
7937
8
7703
9
272809
10
640943
11
5378959
12
116137159
13
3708797237
14
114649314209
15
158317270283
[2,5,7,13,37,73,7937,7703,272809,640943,5378959, 116137159,3708797237,114649314209,158317270283]