You can figure out the "composite numbers" from any table of primes - all the positive integers that are not prime numbers are composite (the number one should also be excluded). The first four composite numbers are:4, 6, 8, 9
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the answer of the first 4 composite numbers is 27
The sum of the first four prime numbers is 17.
There are four of each.
The three composite numbers are 28, 30 and 32. Their sum is 90.
The sum of any two prime numbers is not always a composite number. The sum of 2 and 11 is 13, and 13 is a prime number, not a composite number.