56 of them.
49
Thirty-three
Because many of them are divisible by smaller odd numbers. For example 35 is divisible by 5 and so 35 cannot be a prime number.
84
56 of them.
49
49
Nineteen. They are: 5101520253035404550556065707580859095
109
Thirty-three
Because many of them are divisible by smaller odd numbers. For example 35 is divisible by 5 and so 35 cannot be a prime number.
84
U={whole number greater than 10 but smaller than 30 } X={numbers divisible by 3 } Y Odd numbers
These numbers are called prime. There are many,many prime numbers, some of which are 13,23, and 7
They are all the numbers divisible by 2 with no remainder
If the sum of its' digits are divisible by 3 for all numbers greater than 9.