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A340281 as a simple table

na(n)
12
23
37
419
531
6163
7127
81459
9211
10883
11811
12472393
13631
148503057
1532077
164051
172311
1886093443
194951
206347497291777
2110531
2236451
231299079
24251048476873
258191
26388963
275314411
2822051
2951031
30596046447753906250001
3128351
32411782264189299
3324571
345904901

[2,3,7,19,31,163,127,1459,211,883,811,472393,631,
 8503057,32077,4051,2311,86093443,4951,
 6347497291777,10531,36451,1299079,251048476873,
 8191,388963,5314411,22051,51031,
 596046447753906250001,28351,411782264189299,24571,
 5904901]