18060109
This number is a prime.
The smallest invertible prime p containing all of the
invertible digits {0, 1, 6, 8, 9} such that (p^n + k) is an
emirp, where k is an integer formed by concatenating in
ascending order the first n digits, n times each of them,
(case n=6), i.e., 1061689^6 +
111111222222333333444444555555666666. [Bajpai]
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