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A104247 as a simple table

na(n)
12
25
317
419
523
631
741
861
971
1083
11181
12269
13389
14419
15449
16631
17683
18727
19743
20809
21929
221039
231061
241069
251091
261277
271381
281481
291567
301613
311747
321873
331951
341993
352039
362129
372281
382297
392339
402381
412549
422579

[2,5,17,19,23,31,41,61,71,83,181,269,389,419,449,
 631,683,727,743,809,929,1039,1061,1069,1091,1277,
 1381,1481,1567,1613,1747,1873,1951,1993,2039,2129,
 2281,2297,2339,2381,2549,2579]