2111

This number is a prime.

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The smaller of only two primes less than a googol formed by concatenating in descending order the first n multidigit numbers ending with 1, (case n=2). The other is 41312111 for n=4. [Loungrides]

Submitted: 2018-01-03 18:59:48; Last Modified: 2020-02-15 18:28:57.