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A079018
as a simple table
n
a(n)
1
3
2
7
3
13
4
31
5
43
6
67
7
73
8
151
9
181
10
211
11
241
12
277
13
331
14
463
15
487
16
1597
17
1831
[3,7,13,31,43,67,73,151,181,211,241,277,331,463, 487,1597,1831]