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A247870 as a simple table

na(n)
17
25
311
45
513
65
77
811
95
1017
117
125
1313
1411
155
167
1719
185
197
2017
215
225
2329
245
2511
267
2713
285
2917
307
315
3211
3331
345
357
3623
375
3819
397
405
4129
4213
435
4411
455
467
475
4823
4913
507
515
525
537
5443
555
5611
5717
587
5919
605
6123
625
6311
6413
655
6641
677
6847
6917
705
7131
7211
737
745
7513
7629
775
787
7923
8037
8111
825
8317
847
8513
865
8743
8819
895
905
917
9217
935
9411

[7,5,11,5,13,5,7,11,5,17,7,5,13,11,5,7,19,5,7,17,
 5,5,29,5,11,7,13,5,17,7,5,11,31,5,7,23,5,19,7,5,
 29,13,5,11,5,7,5,23,13,7,5,5,7,43,5,11,17,7,19,5,
 23,5,11,13,5,41,7,47,17,5,31,11,7,5,13,29,5,7,23,
 37,11,5,17,7,13,5,43,19,5,5,7,17,5,11]