repunit


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repunit

(ˈrɛpˌjuːnɪt)
n
any positive integer that consists entirely of the digit 1 repeated, for example, 11, 111, 1111
[short for repeated unit]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
For example, numbers of the form ([10.sup.n] - 1)/9 consist entirely of the digit 1 and are called repunits. Repunits show up frequently in recreational mathematics and it was quite interesting when, in 1986, H.