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A173827 as a simple table

na(n)
12
27
337
443
547
667
773
8149
9163
10167
11223
12337
13349
14353
15359
16409
17421
18439
19487
20499
21577
22587
23617
24691
25787
26823
27829
28911
29947
301039
311063
321087
331201
341297
351321
361361
371367
381453
391459
401483
411609
421621
431657
441777
451783
461987
471993
482011
492137
502143

[2,7,37,43,47,67,73,149,163,167,223,337,349,353,
 359,409,421,439,487,499,577,587,617,691,787,823,
 829,911,947,1039,1063,1087,1201,1297,1321,1361,
 1367,1453,1459,1483,1609,1621,1657,1777,1783,1987,
 1993,2011,2137,2143]