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Repdigit

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 (http://mathworld.wolfram.com/Repdigit)

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