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A203985 as a simple table

na(n)
12
23
313
447
5197
611
729
8443
9397
101321
114831
1215559
13211
145
1519
1641
17293
18113
19971
20419
212687
221087
231709
245851
2523629
2683
2717341
2865171
29268969
3020753
31690607
324273
331289
3481931
3556267
363025961
376343
3841927
391455241
4014255011
4121557
42733
4344351
447

[2,3,13,47,197,11,29,443,397,1321,4831,15559,211,
 5,19,41,293,113,971,419,2687,1087,1709,5851,23629,
 83,17341,65171,268969,20753,690607,4273,1289,
 81931,56267,3025961,6343,41927,1455241,14255011,
 21557,733,44351,7]