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A307687 as a simple table

na(n)
12
22
33
42
55
63
77
82
93
1011
1111
1213
1313
1443
15151
162
1717
1846441
1919
2061681
21368089
22683
2323
24241
255
262731
273
2815790321
2929
30331
3131
322
33599479
3443691
352984619585279628795345143571
36530713
3737
38174763
39900900900900990990990991
4061681
4141
425419
4343
449080418348371887359375390001

[2,2,3,2,5,3,7,2,3,11,11,13,13,43,151,2,17,46441,
 19,61681,368089,683,23,241,5,2731,3,15790321,29,
 331,31,2,599479,43691,
 2984619585279628795345143571,530713,37,174763,
 900900900900990990990991,61681,41,5419,43,
 9080418348371887359375390001]