41

This number is a prime.

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Brittany Finch © 2004

The smallest sexy prime quadruplet that is not part of a sexy prime quintuplet starts at 41. I.e, 41+6, 41+6+6 and 41+6+6+6 are also prime. [Opao]

The largest 2-digit prime which remains prime when 2 is added to any of its digits. I.e., 61 and 43 are primes. [Opao]