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A176821 as a simple table

na(n)
15
211
313
47
529
659
761
831
9659
101319
111321
12661
13809
141619
151621
16811
172129
184259
194261
202131
212549
225099
235101
242551
253329
266659
276661
283331
293389
306779
316781
323391
335849
3411699
3511701
365851
376269
3812539
3912541
406271
4110529
4221059
4321061
4410531

[5,11,13,7,29,59,61,31,659,1319,1321,661,809,1619,
 1621,811,2129,4259,4261,2131,2549,5099,5101,2551,
 3329,6659,6661,3331,3389,6779,6781,3391,5849,
 11699,11701,5851,6269,12539,12541,6271,10529,
 21059,21061,10531]