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A075305 as a simple table

na(n)
15
27
317
419
511
613
729
831
997
1037
1141
1243
1323
1473
15101
1653
17109
18113
1961
20193
2167
22103
2371
24181
25191
2679
27241
28127
2989
30271
3147
32337
33197
34151
35307
36157
37163
38331
39281
40229
4159
42421
43311
44379
45257
46131
47199
48137
49139
50211
51433
52149
53601
54457
55463
56313
57401
58487
5983

[5,7,17,19,11,13,29,31,97,37,41,43,23,73,101,53,
 109,113,61,193,67,103,71,181,191,79,241,127,89,
 271,47,337,197,151,307,157,163,331,281,229,59,421,
 311,379,257,131,199,137,139,211,433,149,601,457,
 463,313,401,487,83]