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A016054
as a simple table
n
a(n)
1
5
2
7
3
137
4
283
5
883
6
991
7
1021
8
1193
9
3671
10
18743
11
31751
12
101089
13
1503503
[5,7,137,283,883,991,1021,1193,3671,18743,31751, 101089,1503503]