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A030670 as a simple table

na(n)
123
231
353
471
5113
6131
7173
8191
9233
10293
11311
12373
13419
14431
15479
165323
17593
18613
19673
20719
21733
22797
23839
248923
25971
261013
271031
2810711
291091
3011311
311277
321319
331373
341399
351493
361511
371571
381637
3916729
401733
4117911
421811
431913
441931

[23,31,53,71,113,131,173,191,233,293,311,373,419,
 431,479,5323,593,613,673,719,733,797,839,8923,971,
 1013,1031,10711,1091,11311,1277,1319,1373,1399,
 1493,1511,1571,1637,16729,1733,17911,1811,1913,
 1931]