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A068364 as a simple table

na(n)
171
2181
3223
4307
5353
6379
7401
8541
9641
10757
111109
121277
131327
141511
151607
161777
171801
181861
191889
202333
212393
222423
232713
242791
252837
262897
272927
282953
293041
303067
313121
323391
333617
343821
353943
364013
374153
384241
394327
404523
414549
424621
435113
445233

[71,181,223,307,353,379,401,541,641,757,1109,1277,
 1327,1511,1607,1777,1801,1861,1889,2333,2393,2423,
 2713,2791,2837,2897,2927,2953,3041,3067,3121,3391,
 3617,3821,3943,4013,4153,4241,4327,4523,4549,4621,
 5113,5233]