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A212286 as a simple table

na(n)
21
33
47
57
621
74
819
91
1037
1131
1239
135
142
1557
1667
1773
187
197
20103
216
22133
23133
24147
25157
2618
277
281
29211
30237
317
32259
33273
34301
351
3613
3710
384
399
40403
41421
423
438
44487
4519
46541
47553
48579
4911
50637
51651
529
53703
5431
55757
5626
579
58853
59871
60903
6113
6227
632
641027
651
661101
6711
681159
691191

[1,3,7,7,21,4,19,1,37,31,39,5,2,57,67,73,7,7,103,
 6,133,133,147,157,18,7,1,211,237,7,259,273,301,1,
 13,10,4,9,403,421,3,8,487,19,541,553,579,11,637,
 651,9,703,31,757,26,9,853,871,903,13,27,2,1027,1,
 1101,11,1159,1191]