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A158878
as a simple table
n
a(n)
1
3
2
5
3
37
4
41
5
43
6
59
7
71
8
113
9
181
10
293
11
383
12
421
13
1109
14
1187
15
1997
16
3109
17
4889
18
5581
19
67961
20
74843
[3,5,37,41,43,59,71,113,181,293,383,421,1109,1187, 1997,3109,4889,5581,67961,74843]