3151332323

This number is a prime.

+ The smallest prime concatenation of two consecutive palindromic primes (31513 and 32323) that form prime numbers with either of them placed first. 3232331513 is also prime. [Gaydos]

+ The smallest emirp formed from the concatenation of two consecutive palindromic primes, i.e., {31513||32323}. [Bajpai]

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