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Rough number : ウィキペディア英語版 | 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''. ''k''-roughness has alternately been defined as requiring all prime factors to strictly exceed ''k''.〔p. 130, Naccache and Shparlinski 2009.〕 ==Examples (after Finch)== #Every odd positive integer is 3-rough. #Every positive integer that is congruent to 1 or 5 mod 6 is 5-rough. #Every positive integer is 2-rough, since all its prime factors, being prime numbers, exceed 1.
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