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A117874 as a simple table

na(n)
117
261
3131
4151
5271
6523
7541
8571
9751
10797
11971
12991
13997
141291
151321
161361
171741
181901
191913
202011
212179
222297
232341
242441
252447
262551
272791
282851
293301
303511
313761
323803
334051
344391
354397
364423
374441
384561
394651
404703
414759
425101
435471
445483
455521

[17,61,131,151,271,523,541,571,751,797,971,991,
 997,1291,1321,1361,1741,1901,1913,2011,2179,2297,
 2341,2441,2447,2551,2791,2851,3301,3511,3761,3803,
 4051,4391,4397,4423,4441,4561,4651,4703,4759,5101,
 5471,5483,5521]