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A068363 as a simple table

na(n)
123
261
371
4109
5157
6173
7199
8211
9223
10239
11269
12283
13373
14383
15421
16443
17487
18503
19547
20599
21691
22701
23719
24829
25991
261031
271153
281289
291297
301319
311399
321433
331453
341531
351579
361619
371667
381721
391823
401873
411907
421979
432029
442153
452251
462269
472381

[23,61,71,109,157,173,199,211,223,239,269,283,373,
 383,421,443,487,503,547,599,691,701,719,829,991,
 1031,1153,1289,1297,1319,1399,1433,1453,1531,1579,
 1619,1667,1721,1823,1873,1907,1979,2029,2153,2251,
 2269,2381]