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A256970 as a simple table

na(n)
15
217
337
45
5101
65
7197
8257
95
10401
115
12577
13677
145
1517
165
1713
181297
195
201601
215
2213
2329
245
2541
265
272917
283137
295
3013
315
3217
334357
345
3513
365
375477
3853
395
4037
415
427057
4313
445
458101
465
478837
4813
495
5073
515
5229
5317
545
5512101
565
5741
5813457
595

[5,17,37,5,101,5,197,257,5,401,5,577,677,5,17,5,
 13,1297,5,1601,5,13,29,5,41,5,2917,3137,5,13,5,17,
 4357,5,13,5,5477,53,5,37,5,7057,13,5,8101,5,8837,
 13,5,73,5,29,17,5,12101,5,41,13457,5]