In recreational mathematics, a repunit is a number like 11, 111, or 1111 that contains only the digit 1 — the simplest form of repdigit. The term stands for repeated unit and was coined in 1966 by Albert H. Beiler in his book Recreations in the Theory of Numbers. A repunit prime is a repunit that is also a prime number. In binary, these are the ...
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http://en.wikipedia.org/wiki/Repunit
number consisting of two or more identical integers
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http://phrontistery.info/r.html
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