72727

This number is a prime.

+ The sum of the digits of the first 72 primes is 727, another palindromic prime. Submitted on 7/27. [Trotter]

+ prime(prime(prime(prime(prime(one dozen))))). [Merickel]

+ The largest prime-digit palindromic prime time occurring at prime hours, prime minutes, and prime seconds, on a 12-hour digital clock. [Loungrides]

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