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A171969 as a simple table

na(n)
12
23
35
47
513
619
731
847
979
10127
11211
12331
13523
14853
151367
162207
173581
185779
199371
2015131
2124481
2239607
2364081
24103687
25167771
26271451
27439217
28710663
291149857
301860503
313010363
324870861
337881221
3412752053
3520633279

[2,3,5,7,13,19,31,47,79,127,211,331,523,853,1367,
 2207,3581,5779,9371,15131,24481,39607,64081,
 103687,167771,271451,439217,710663,1149857,
 1860503,3010363,4870861,7881221,12752053,20633279]