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A247068 as a simple table

na(n)
12
25
317
437
541
673
7137
8149
9257
10277
11293
12337
13521
14577
15593
16641
17661
18673
19677
201033
211061
221093
231097
241109
251153
261193
271289
281297
291301
301321
311361
322053
332069
342081
352089
362113
372129
382213
392309
402341
412377
422389
432593
442633
452689
462693
472729
484129
494133
504177
514229
524241
534261
544357
554373
564421
574649
584673
595153
605189

[2,5,17,37,41,73,137,149,257,277,293,337,521,577,
 593,641,661,673,677,1033,1061,1093,1097,1109,1153,
 1193,1289,1297,1301,1321,1361,2053,2069,2081,2089,
 2113,2129,2213,2309,2341,2377,2389,2593,2633,2689,
 2693,2729,4129,4133,4177,4229,4241,4261,4357,4373,
 4421,4649,4673,5153,5189]