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A068231 as a simple table

na(n)
111
223
347
459
571
683
7107
8131
9167
10179
11191
12227
13239
14251
15263
16311
17347
18359
19383
20419
21431
22443
23467
24479
25491
26503
27563
28587
29599
30647
31659
32683
33719
34743
35827
36839
37863
38887
39911
40947
41971
42983
431019
441031
451091
461103
471151
481163
491187
501223

[11,23,47,59,71,83,107,131,167,179,191,227,239,
 251,263,311,347,359,383,419,431,443,467,479,491,
 503,563,587,599,647,659,683,719,743,827,839,863,
 887,911,947,971,983,1019,1031,1091,1103,1151,1163,
 1187,1223]