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A139839 as a simple table

na(n)
12
247
359
471
5107
6131
7191
8227
9311
10359
11419
12431
13443
14467
15479
16503
17563
18599
19659
20683
21839
22887
23971
241031
251103
261151
271163
281187
291223
301259
311307
321427
331451
341523
351559
361583
371619
381787
391823
401847
411907
421931
432003
442087
452267

[2,47,59,71,107,131,191,227,311,359,419,431,443,
 467,479,503,563,599,659,683,839,887,971,1031,1103,
 1151,1163,1187,1223,1259,1307,1427,1451,1523,1559,
 1583,1619,1787,1823,1847,1907,1931,2003,2087,2267]