Sequence of Powers of 9

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Integer Sequence

The sequence of powers of $9$ begins:

$1, 9, 81, 729, 6561, 59 \, 049, 531 \, 441, 4 \, 782 \, 969, 43 \, 046 \, 721, 387 \, 420 \, 489, \ldots$

This sequence is A001019 in the On-Line Encyclopedia of Integer Sequences (N. J. A. Sloane (Ed.), 2008).