This number is a prime.

+ The smallest prime-digit Honaker prime p containing all of the prime digits {2, 3, 5, 7} such that (p^n + k) is prime where k is an integer formed by concatenating in ascending order the first n digits d, d times each of them, (case n=8), i.e., 2223757^8 + 122333444455555666666777777788888888. [Bajpai]

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