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A200959 as a simple table

na(n)
1503
2991
310639
421943
597327
6124991
7195103
8314423
9438967
10511991
111404919
121815839
132097143
142743991
153112127
163241783
173511799
184095991
194574287
204912991
215088439
229528119
2311543167
2412166991
2514172479
2617984719
2721951991

[503,991,10639,21943,97327,124991,195103,314423,
 438967,511991,1404919,1815839,2097143,2743991,
 3112127,3241783,3511799,4095991,4574287,4912991,
 5088439,9528119,11543167,12166991,14172479,
 17984719,21951991]