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A284531 as a simple table

na(n)
131
241
371
497
5139
6193
7337
8349
9421
10487
11587
12619
13643
14701
15811
16827
171021
181051
191093
201217
211249
221259
231471
241571
251721
261747
271861
281949
292087
302131
312383
322521
332549
342591
352957
363023
373083
383209
393529
403613
413779
423833
433947
444283
454409
464451
474481
484483
494567
504591
514733

[31,41,71,97,139,193,337,349,421,487,587,619,643,
 701,811,827,1021,1051,1093,1217,1249,1259,1471,
 1571,1721,1747,1861,1949,2087,2131,2383,2521,2549,
 2591,2957,3023,3083,3209,3529,3613,3779,3833,3947,
 4283,4409,4451,4481,4483,4567,4591,4733]