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A338556 as a simple table

na(n)
127
263
3117
4147
5171
6261
7273
8333
9343
10387
11399
12477
13507
14549
15609
16637
17639
18711
19741
20777
21801
22903
23909
24931
25963
261017
271083
281113
291131
301179
311183
321251
331281
341359
351421
361443
371467
381491
391557
401629
411653
421659
431677
441729
451737
461791
471813
481869

[27,63,117,147,171,261,273,333,343,387,399,477,
 507,549,609,637,639,711,741,777,801,903,909,931,
 963,1017,1083,1113,1131,1179,1183,1251,1281,1359,
 1421,1443,1467,1491,1557,1629,1653,1659,1677,1729,
 1737,1791,1813,1869]