169

This number is a composite.

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The smallest square such that every digit (d) repeated d times gives prime. Note that the same is true if we reverse or invert the digits of the number 169, i.e. 1666666999999999, 9999999996666661 and 6666669999999991 are all primes. [Petrov]

Submitted: 2018-12-24 03:46:41;   Last Modified: 2018-12-24 08:22:53.
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