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A187810 as a simple table

na(n)
231
37
43
53
63
73
82
917
1017
112
1217
132
14107
1559
1671
17107
18101
19179
20197
21431
22179
23521
24431
25431
26809
27179
28599
29641
30809
312081
321061
33827
341949
35809
362801
372381
381481
391697
402087
411697
424127
432801
443929
454019
463329
474517
4817597
495477
506761
5113829
5212239
535639

[31,7,3,3,3,3,2,17,17,2,17,2,107,59,71,107,101,
 179,197,431,179,521,431,431,809,179,599,641,809,
 2081,1061,827,1949,809,2801,2381,1481,1697,2087,
 1697,4127,2801,3929,4019,3329,4517,17597,5477,
 6761,13829,12239,5639]