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A248146 as a simple table

na(n)
113
25
37
43
511
613
75
817
919
107
1123
1228081
1331
1411
15131
1613
1741
1843
195
2047
214951
2253
235557
2459
2561
267
27218923
2871
2973
307577
3179
323
3383
3485878991939597
3511
36101
37103
38105107
39109
4037
41113
42115117

[13,5,7,3,11,13,5,17,19,7,23,28081,31,11,131,13,
 41,43,5,47,4951,53,5557,59,61,7,218923,71,73,7577,
 79,3,83,85878991939597,11,101,103,105107,109,37,
 113,115117]