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A071580 as a simple table

na(n)
12
23
37
443
53613
665250781
75109197227031017
821753246920584523633819544186061
9993727878334632126576336773629979379563850938567846991629270287

[2,3,7,43,3613,65250781,5109197227031017,
 21753246920584523633819544186061,
 99372787833463212657633677362997937956385093856784\
 6991629270287]