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Rough number
A k-rough number, as defined by Finch in 2001 and 2003, is a positive integer whose prime factors are all greater than or equal to k. For example, every odd integer is 3-rough; every integer that is congruent to 1 or 5 mod 6 is 5-rough.
See also
Smooth number
References
Weisstein, Eric W., "Rough Number" from MathWorld.
Finch's definition from Number Theory Archives
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