237375311

This number is a prime.

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+ (237375311 + k*118560155)*109# + 1 (for k = 0, 1, ... , 14) is the largest known case of 15 primes in arithmetic progression as of September 2009 (Mike Oakes). Note that 109 is prime and so is the reversal of 118560155. [Beedassy]

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