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Regular numbers are numbers that evenly divide powers of 60 (or, equivalently, powers of 30). Equivalently, they are the numbers whose only prime divisors are 2, 3, and 5. As an example, 602 = 3600 = 48 × 75, so as divisors of a power of 60 both 48 and 75 are regular. These numbers arise in several areas of mathematics and its applications, and have different names coming from their different areas of study.

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  • عدد نظامي (ar)
  • Regular number (en)
  • Регулярное число (ru)
  • 正规数 (整数) (zh)
rdfs:comment
  • عدد نظامي (بالإنجليزية: Regular number)‏ هو عدد صحيح طبيعي لن تجد في تفكيكه إلى جداء أعداد أولية غير الاثنين والثلاثة والخمسة. (ar)
  • 正规数(Regular numbers)是指可以整除60的乘幂的整數,也就是60乘幂的的因數,例如602 = 3600 = 48 × 75,48和75都可以整除60的平方,也都是正规数。 在許多數學及應用的領域會用到60乘幂的因數,在不同的領域中其名稱也有所不同。 * 在數論中,60乘幂的因數也稱為5-光滑數,因為其質因數只有2,3或是5,這是k-光滑數中的一個特例,k-光滑數是指其質因數都小於等於k的整數。 * 在巴比伦数学中,60乘幂的因數稱為正规数或是60正规数,因為巴比伦数学是使用六十進制,因此這類數字格外的重要。 * 在計算機科學,60乘幂的因數稱為漢明數(Hamming numbers),得名自數學家理查德·衛斯里·漢明,他提出一個用電腦依序找出60乘幂的因數的演算法。 (zh)
  • Regular numbers are numbers that evenly divide powers of 60 (or, equivalently, powers of 30). Equivalently, they are the numbers whose only prime divisors are 2, 3, and 5. As an example, 602 = 3600 = 48 × 75, so as divisors of a power of 60 both 48 and 75 are regular. These numbers arise in several areas of mathematics and its applications, and have different names coming from their different areas of study. (en)
  • Регулярные числа — это числа, которые равномерно делят степени 60 (или, что эквивалентно, степени 30). Например, 602 = 3600 = 48 × 75, поэтому и 48, и 75 являются делителями степени 60. Таким образом, они являются обычными числами. Эквивалентно, это числа, единственные простые делители которых равны 2, 3 и 5. Числа, которые равномерно делят степень 60, возникают в нескольких областях математики и её приложений и имеют разные названия, взятые из этих разных областей исследования. (ru)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/Regular_divisibility_lattice.svg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Table_de_division_et_de_conversion_des_fractions_-_Louvre_-_AO_6456.jpg
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