Less than 20:
4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20
Less than 30:
4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28, 30
1260 of them.
74
There are 15 prime numbers and 34 composite numbers because 1 is not considered to be a prime or composite number
There are 15 composite numbers greater than 50 but less than 70
3 composite numbers, 21, 22, and 24, are greater than 20 but less than 25.
There are 18 that are less than 30.
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.
Three of them.
49 of them.
Of the 1499 numbers less than 1500, number 1 is neither prime nor composite, 239 are primes, and the remaining 1259 are composites.
Five.
24