Main Page | See live article | Alphabetical index In mathematics, a repdigit is a number composed of repeated instances of the same digit. Examples in base ten are 11, 222, 4444, 77777, and 999999. All repdigits are multiples of repunits. One of the most famous repdigits is 666. External link Repdigits at MathWorld This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.