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A253598 as a simple table

na(n)
1399
2399
3935
4399
5935
62015
7935
8399
9399
104991
1151359
122015
138855
141584599
159486399
1620705
175719
1818095
192915
20935
21399
2246079
23162687
242015
2522847
2646079
2716719263
288855
2912719
307055
31935
3280189
33189099039
34104663
3520705
36482143
37196559
3860059
3930073928079
4090287
418855
4231535

[399,399,935,399,935,2015,935,399,399,4991,51359,
 2015,8855,1584599,9486399,20705,5719,18095,2915,
 935,399,46079,162687,2015,22847,46079,16719263,
 8855,12719,7055,935,80189,189099039,104663,20705,
 482143,196559,60059,30073928079,90287,8855,31535]