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A068873 as a simple table

na(n)
12
25
319
417
543
641
779
883
9127
10131
11199
12197
13283
14281
15379
16389
17499
18509
19643
20641
21809
22809
23983
24971
251171
261163
271381
281373
291609
301607
311861
321861
332137
342137
352437
362441
372749
382767
393109
403109
413457
423457
433833
443847
454243
464241
474663
484679
495119

[2,5,19,17,43,41,79,83,127,131,199,197,283,281,
 379,389,499,509,643,641,809,809,983,971,1171,1163,
 1381,1373,1609,1607,1861,1861,2137,2137,2437,2441,
 2749,2767,3109,3109,3457,3457,3833,3847,4243,4241,
 4663,4679,5119]