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A139972 as a simple table

na(n)
173
297
3137
4193
5353
6457
7577
8593
9617
10977
111033
121097
131217
141553
151657
161697
171753
181913
192017
202113
212137
222153
232273
242377
252593
262633
272657
282777
292897
302953
313217
323257
333313
343593
353673
363697
373833
384153
394217
404297
414337
424457

[73,97,137,193,353,457,577,593,617,977,1033,1097,
 1217,1553,1657,1697,1753,1913,2017,2113,2137,2153,
 2273,2377,2593,2633,2657,2777,2897,2953,3217,3257,
 3313,3593,3673,3697,3833,4153,4217,4297,4337,4457]