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A031908 as a simple table

na(n)
15
231
367
4103
5149
6191
7233
8277
9331
10379
11431
12467
13523
14587
15631
16677
17739
18797
19853
20907
21967
221019
231063
241117
251187
261237
271297
281367
291433
301483
311543
321597
331637
341709
351777
361847
371901
381979
392027
402087
412141
422221
432281
442341

[5,31,67,103,149,191,233,277,331,379,431,467,523,
 587,631,677,739,797,853,907,967,1019,1063,1117,
 1187,1237,1297,1367,1433,1483,1543,1597,1637,1709,
 1777,1847,1901,1979,2027,2087,2141,2221,2281,2341]