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A211681 as a simple table

na(n)
12
23
35
47
523
637
753
873
9237
10373
11537
12737
132373
143737
155373
167373
1723737
1837373
1953737
2073737
21237373
22373737
23537373
24737373
252373737
263737373
275373737
287373737
2923737373
3037373737
3153737373
3273737373
33237373737
34373737373
35537373737
36737373737

[2,3,5,7,23,37,53,73,237,373,537,737,2373,3737,
 5373,7373,23737,37373,53737,73737,237373,373737,
 537373,737373,2373737,3737373,5373737,7373737,
 23737373,37373737,53737373,73737373,237373737,
 373737373,537373737,737373737]