5479

This number is a prime.

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The sum of all multidigit composite repdigit numbers less than a thousand, i.e., 22+33+44+55+66+77+88+99+111+222+333+444+555+666+777+888+999. [Loungrides]

Submitted: 2016-07-22 17:57:29; Last Modified: 2016-07-23 04:55:40.