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A247827 as a simple table

na(n)
15
27
35
411
55
613
75
87
911
105
117
125
1313
1419
155
167
175
1823
1917
207
2113
225
2311
245
2519
265
277
2817
295
3029
317
325
3311
345
357
3631
375
3817
397
4011
415
4213
435
4423
4519
465
477
4817
495
5013
5137
527
535
5411
5531
565
577
5819
5913
605
6111
627
635
6429
655
6613
6711
685
697

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