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A106074 as a simple table

na(n)
15
27
319
429
559
673
797
8103
9139
10167
11197
12223
13239
14337
15349
16383
17397
18409
19419
20503
21547
22577
23587
24593
25617
26643
27677
28743
29757
30787
31839
32883
331049
341093
351097
361123
371163
381217
391249
401277
411303
421399
431487
441627
451637
461657
471667
481697
491753
501847

[5,7,19,29,59,73,97,103,139,167,197,223,239,337,
 349,383,397,409,419,503,547,577,587,593,617,643,
 677,743,757,787,839,883,1049,1093,1097,1123,1163,
 1217,1249,1277,1303,1399,1487,1627,1637,1657,1667,
 1697,1753,1847]