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A241487 as a simple table

na(n)
17
253
367
4157
5191
6311
7331
8347
9353
10373
11443
12563
13571
14641
15821
16823
17857
18941
191033
201087
211123
221283
231423
241607
251621
261873
271997
282011
292137
302333
312383
322543
332657
342677
352797
362957
373301
383511
393607
403671
413691
423797
433847
444133
455113
465147
475231

[7,53,67,157,191,311,331,347,353,373,443,563,571,
 641,821,823,857,941,1033,1087,1123,1283,1423,1607,
 1621,1873,1997,2011,2137,2333,2383,2543,2657,2677,
 2797,2957,3301,3511,3607,3671,3691,3797,3847,4133,
 5113,5147,5231]