Rectangular numbers are a subset of composite numbers.
The squares of prime numbers will be composite but not rectangular.
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Some factors are prime numbers, some are composite.
1,4,6,8,9,10,12,14,15,16,18,20,21,22,24,25,26,27,28,30,32,33,34,35,36,38,39 are the composite numbers between 1 and 40.
composite numbers between 11 and 21:12 14 15 16 18
Not all numbers between 20 and 28 are composite numbers. 23 is a prime number.
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