32+33+34+35+36 (31 is a Prime number) = 170
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the answer of the first 4 composite numbers is 27
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
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.
The sum of two prime numbers will be composite unless one of the prime numbers is 2.