Jisho

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ごうせいすう 合成数
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Noun
1. composite number; composite quantity​Mathematics
Wikipedia definition
2. Composite number​A composite number is a positive integer which has a positive divisor other than one or itself. In other words a composite number is any positive integer greater than one that is not a prime number. So, if n > 0 is an integer and there are integers 1 < a, b < n such that n = a × b, then n is composite. By definition, every integer greater than one is either a prime number or a composite number. The number one is a unit – it is neither prime nor composite.
Read “Composite number” on English Wikipedia
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