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A112715 as a simple table

na(n)
13
27
311
423
531
647
779
8127
9191
10223
11239
12383
13479
14607
15863
16991
171087
181151
191279
201471
211663
222111
232239
242687
252879
263391
273583
283967
295119
305503
316143
326271
336911
347039
358191
368447
378831
389343
3910111
4011519
4111903
4212671
4312799
4413183
4513567

[3,7,11,23,31,47,79,127,191,223,239,383,479,607,
 863,991,1087,1151,1279,1471,1663,2111,2239,2687,
 2879,3391,3583,3967,5119,5503,6143,6271,6911,7039,
 8191,8447,8831,9343,10111,11519,11903,12671,12799,
 13183,13567]