4,6,8,9,10,12,14,15,16,18,20,21,22,24,25,26,27,28,30,32,33,34,35
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They are all composite numbers whose GCF is 1
35.
Look for a table of prime numbers. All the odd numbers that are NOT on this list are composite numbers.
1, 5, 7, 35, composite
All square numbers greater than 1 are composite.