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A247178 as a simple table

na(n)
17
213
331
4103
5157
6211
7229
8277
9283
10337
11349
12367
13373
14379
15433
16463
17499
18523
19547
20577
21613
22619
23643
24673
25751
26907
27937
281009
291021
301039
311123
321201
331231
341327
351399
361459
371489
381543
391579
401597
411669
421723
431777
441789
451831
461873
471933
481987
492011
502017

[7,13,31,103,157,211,229,277,283,337,349,367,373,
 379,433,463,499,523,547,577,613,619,643,673,751,
 907,937,1009,1021,1039,1123,1201,1231,1327,1399,
 1459,1489,1543,1579,1597,1669,1723,1777,1789,1831,
 1873,1933,1987,2011,2017]