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A194581 as a simple table

na(n)
13
27
313
419
543
6103
7109
8193
9229
10313
11349
12401
13463
14491
15509
16643
17743
18761
19823
20859
21883
22911
23997
241093
251237
261279
271303
281429
291459
301483
311489
321499
331571
341609
351637
361831
371873
381999
392003
402069
412083
422221
432239
442243
452251
462269
472273
482399

[3,7,13,19,43,103,109,193,229,313,349,401,463,491,
 509,643,743,761,823,859,883,911,997,1093,1237,
 1279,1303,1429,1459,1483,1489,1499,1571,1609,1637,
 1831,1873,1999,2003,2069,2083,2221,2239,2243,2251,
 2269,2273,2399]