All even numbers from 4 upwards are composite numbers and that 2 is the only even Prime number.
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what is the ratio or prime numbers to composite numbers in this list/10,11,2,13,14,15,16,1,7,18,19,20,21
It is impossible to list the infinite number of prime numbers and composite numbers.
That's an infinite list.
Look for a table of prime numbers. All the odd numbers that are NOT on this list are composite numbers.
That's an infinite list.