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A177746 as a simple table

na(n)
12
23
313
423
597
6101
7103
8109
9131
10457
11641
12677
13751
14787
15811
16881
17977
181019
191049
202719
212753
222777
232909
243067
253083
263203
273329
283331
293547
303557
313613
323767
333823
343833
353847
363911
373929
384007
394159
404219
414259
424327
434421
444591
454639

[2,3,13,23,97,101,103,109,131,457,641,677,751,787,
 811,881,977,1019,1049,2719,2753,2777,2909,3067,
 3083,3203,3329,3331,3547,3557,3613,3767,3823,3833,
 3847,3911,3929,4007,4159,4219,4259,4327,4421,4591,
 4639]