11

This number is a prime.

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The only number in base ten that is not Nivenmorphic ; In other words, 11 never divides a number ending in 11 if its sum of digits is also equal to 11. [Boscaro and Beedassy]

Submitted: 2001-07-31 10:53:48; Last Modified: 2014-07-21 03:48:28.