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A139862 as a simple table

na(n)
15
231
371
4109
5149
6151
7229
8239
9271
10349
11359
12421
13431
14461
15479
16509
17541
18631
19661
20709
21821
22839
23941
241021
251061
261151
271181
281229
291279
301319
311399
321471
331549
341669
351709
361789
371831
381861
391879
402039
412069
422111
432221
442269
452309

[5,31,71,109,149,151,229,239,271,349,359,421,431,
 461,479,509,541,631,661,709,821,839,941,1021,1061,
 1151,1181,1229,1279,1319,1399,1471,1549,1669,1709,
 1789,1831,1861,1879,2039,2069,2111,2221,2269,2309]