113

This number is a prime.

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113^2 + 131^2 = 173^2 + 1, where 113, 131, 173 are three consecutive Sophie Germain primes. Is this unique? [Gaydos]

The highest named prime-numbered chemical element is now Nihonium, atomic number 113. If you replace each letter in its name with its numeric position in the alphabet you get 1498151492113 (a prime number ending in 113). [Gaydos]