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A273048 as a simple table

na(n)
15
27
311
419
523
637
771
879
9101
10127
11293
12307
13311
14331
15479
16541
17761
18859
19863
201009
211019
221063
231277
241381
251409
261759
271823
281999
292003
302017
312111
322131
332141
342281
352357
363061
373137
383163
393389
403391
413557
423571
433761
444327
454493
464507
474733
484987
495021
505119
515153
525179
535279
545431
555507
565563
575927
586043
596197
606343

[5,7,11,19,23,37,71,79,101,127,293,307,311,331,
 479,541,761,859,863,1009,1019,1063,1277,1381,1409,
 1759,1823,1999,2003,2017,2111,2131,2141,2281,2357,
 3061,3137,3163,3389,3391,3557,3571,3761,4327,4493,
 4507,4733,4987,5021,5119,5153,5179,5279,5431,5507,
 5563,5927,6043,6197,6343]