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A338121
as a simple table
n
a(n)
1
1
2
2
3
3
4
4
5
5
6
7
7
31
8
43
9
67
10
79
11
85
12
87
13
103
14
115
15
475
16
643
17
1015
18
1399
19
1495
20
1723
21
1819
22
1939
23
1987
[1,2,3,4,5,7,31,43,67,79,85,87,103,115,475,643, 1015,1399,1495,1723,1819,1939,1987]