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A309738 as a simple table

na(n)
13
27
313
431
543
673
7421
82551
96481
108191
11250501
124002001
1364008001
1481009001
1540000200001
1690000300001
1764000008000001
18400000000020000000001
193600000000060000000001
2064000000000008000000000001
2190000000000000300000000000001
22250000000000000500000000000001

[3,7,13,31,43,73,421,2551,6481,8191,250501,
 4002001,64008001,81009001,40000200001,90000300001,
 64000008000001,400000000020000000001,
 3600000000060000000001,64000000000008000000000001,
 90000000000000300000000000001,
 250000000000000500000000000001]