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A115617 as a simple table

na(n)
12
23
35
47
511
619
729
847
971
10127
11191
12319
13551
141007
151711
162687
174703
188447
1915179
2028079
2145997
2289599
23138959
24257513
25485657
26834557
271433501
282854189
294726127
308814047
3115692153
3230078877
3353574623
3494189807
35177848059
36322928189

[2,3,5,7,11,19,29,47,71,127,191,319,551,1007,1711,
 2687,4703,8447,15179,28079,45997,89599,138959,
 257513,485657,834557,1433501,2854189,4726127,
 8814047,15692153,30078877,53574623,94189807,
 177848059,322928189]