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A139919 as a simple table

na(n)
117
273
397
4257
5313
6353
7433
8577
9593
10857
11937
121097
131153
141193
151217
161433
171553
181657
191697
201753
211777
221993
232113
242273
252393
262593
272617
282777
292833
302897
312953
323433
333457
343617
353673
363793
374073
384177
394217
404273
414297
424457

[17,73,97,257,313,353,433,577,593,857,937,1097,
 1153,1193,1217,1433,1553,1657,1697,1753,1777,1993,
 2113,2273,2393,2593,2617,2777,2833,2897,2953,3433,
 3457,3617,3673,3793,4073,4177,4217,4273,4297,4457]