There is no general rule. There is no general rule for primes in any interval and, by extension, there is none for composites.
composite numbers are less than 12: 4, 6, 8, 9, 10
The sum of the composite numbers that are less than 8 is: 4+6 = 10
9 and 15 are the only two odd composite numbers less than twenty.
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There are 15 prime numbers and 34 composite numbers because 1 is not considered to be a prime or composite number
3 composite numbers, 21, 22, and 24, are greater than 20 but less than 25.
There are 15 composite numbers greater than 50 but less than 70
The composite numbers that are between 1 and 20 inclusive are: 4 6 8 9 10 12 14 15 16 18 20 This is a total of eleven composite numbers equal to 20 and below.
The composite numbers less than 20 are: 4, 6, 8, 9, 10, 12, 14, 15, 16, 18
Composite numbers have more than two factors. So, the numbers which have two or less than two factors are not composite numbers. Numbers which have exactly two factors are prime numbers. 1 is an exceptional case because it is neither prime nor composite since it has only one factor which is 1.
1260 of them.
The ones with less than three factors.