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A139950 as a simple table

na(n)
15
297
3157
4257
5313
6353
7397
8433
9577
10773
11797
121013
131153
141193
151237
161277
171433
181637
191697
201753
211973
222113
232357
242677
252693
262777
272897
282953
292957
303037
313433
323457
333617
343793
353853
363877
374073
384093
394217
404273
414357
424493

[5,97,157,257,313,353,397,433,577,773,797,1013,
 1153,1193,1237,1277,1433,1637,1697,1753,1973,2113,
 2357,2677,2693,2777,2897,2953,2957,3037,3433,3457,
 3617,3793,3853,3877,4073,4093,4217,4273,4357,4493]