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A243457 as a simple table

na(n)
15
27
313
419
531
637
7127
8139
9151
10163
11181
12193
13307
14313
15331
16349
17367
18379
19547
20571
21577
22991
23997
241009
251033
261051
271117
281123
291129
301171
311201
321213
331231
341249
351279
361297
371321
381327
391399
401429
411453
421459
431489
441543
451567
461579
471597
481609

[5,7,13,19,31,37,127,139,151,163,181,193,307,313,
 331,349,367,379,547,571,577,991,997,1009,1033,
 1051,1117,1123,1129,1171,1201,1213,1231,1249,1279,
 1297,1321,1327,1399,1429,1453,1459,1489,1543,1567,
 1579,1597,1609]