They are from zero: 4, 6, 8, 9 and 10
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Let's try 99 and 98! 99 is 3 x 3 x 11 and 98 is 2 x 7 x 7 98 and 99 are consecutive numbers, composite numbers, less than 100 and there is no prime numbers between them!
The set of composite numbers includes all whole numbers greater than 1 that are not prime numbers. The first few composite numbers are 2, 4, 6, 8, 11, 13, etc.
11 is a prime number. Multiples of 11 greater than 11 are composite. Composite multiples of 11 in that range are 22, 33, 44, 55, 66 and just keep adding 11 till you get to 396.
None of the numbers 7, 11, and 13 are composite numbers; they are all primes.
2 is the smallest prime number. 9 is the greatest composite number less than 10. The sum of 2 and 9 is 11.