997

This number is a prime.

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The sum of digits of the largest 3-digit prime (997) provides the number of primes less than or equal to the largest 2-digit prime. This is not true for any other tier of n-digit numbers. [Green]

Submitted: 2010-01-18 18:16:02;   Last Modified: 2019-01-31 22:07:21.
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