1809169

This number is a prime.

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The smallest invertible prime p containing all of the invertible digits {0, 1, 6, 8, 9} that yields a 13 digit pandigital pentagonal: {p(3p - 1)/2 = 4909637801257}. [Bajpai]

Submitted: 2020-04-09 12:45:10; Last Modified: 2020-04-09 12:46:18.