Sequence of Powers of 7

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Integer Sequence

The sequence of powers of $7$ begins:

$1, 7, 49, 343, 2401, 16 \, 807, 117 \, 649, 823 \, 543, 5 \, 764 \, 801, 40 \, 353 \, 607, \ldots$

This sequence is A000420 in the On-Line Encyclopedia of Integer Sequences (N. J. A. Sloane (Ed.), 2008).