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A209407 as a simple table

na(n)
13
27
313
423
531
647
7113
8139
9199
10211
11293
12317
13523
141327
151669
161951
172179
182477
192971
203271
214297
224831
235591
245749
255953
266491
276917
287253
298467
309551
319973
3210799
3311743
3415683
3519609
3631397
3734061
3835617
3935677
4043331
4144293
4245893
4348679
4458831

[3,7,13,23,31,47,113,139,199,211,293,317,523,1327,
 1669,1951,2179,2477,2971,3271,4297,4831,5591,5749,
 5953,6491,6917,7253,8467,9551,9973,10799,11743,
 15683,19609,31397,34061,35617,35677,43331,44293,
 45893,48679,58831]