55555

This number is a composite.

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The larger of two repdigit numbers consisting of d identical digits d whose the concatenation in order of all prime factors is prime, i.e., 55555 = 5*41*271 and 541271 is prime. (The other is 22 for which, 22 = 2*11 and 211 is prime). [Loungrides]

Submitted: 2015-04-28 18:44:24;   Last Modified: 2018-04-07 14:03:42.
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