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A224718 as a simple table

na(n)
17
241
343
4107
5157
6193
7239
8251
9257
10293
11307
12443
13457
14557
15577
16593
17607
18643
19743
20757
21829
22857
23907
241093
251193
261303
271307
281451
291483
301493
311543
321607
331657
341693
351723
361789
371907
381993
392143
402207
412243
422267
432293
442309
452357
462393
472543

[7,41,43,107,157,193,239,251,257,293,307,443,457,
 557,577,593,607,643,743,757,829,857,907,1093,1193,
 1303,1307,1451,1483,1493,1543,1607,1657,1693,1723,
 1789,1907,1993,2143,2207,2243,2267,2293,2309,2357,
 2393,2543]