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A139980 as a simple table

na(n)
197
2113
3193
4257
5337
6433
7673
8857
9953
10977
111097
121153
131193
141433
151553
161777
171913
182017
192273
202377
212393
222473
232617
242713
252777
262833
272953
283137
293257
303433
313457
323593
333793
343833
354057
364217
374297
384513
394657
404673
414817
424993

[97,113,193,257,337,433,673,857,953,977,1097,1153,
 1193,1433,1553,1777,1913,2017,2273,2377,2393,2473,
 2617,2713,2777,2833,2953,3137,3257,3433,3457,3593,
 3793,3833,4057,4217,4297,4513,4657,4673,4817,4993]