Repdigit

In recreational mathematics, a repdigit or sometimes monodigit is a natural number composed of repeated instances of the same digit in a positional number system (often implicitly decimal). The word repdigit is a portmanteau, formed from repeated digit. ...
Found on http://en.wikipedia.org/wiki/Repdigit

repdigit

A number composed of repetition of a single digit in a given base, generally taken as base 10 unless otherwise specified. For example, the Beast Number 666 is a (base-10) repdigit.
Found on http://www.daviddarling.info/encyclopedia/R/repdigit.html
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