Multiples of 10 cannot be prime.
prime numbers can only be multiples of 1 and itself. perhaps 3 is just the number you want.
Multiples of 50 are the only numbers that are both. All other multiples of 5 aren't.
Write out the numbers 1 to 50 in 5 rows. Cross out 1. Start at 2 and cross out multiples of 2. That would eliminate all the rest of the even numbers. Go to the next uncrossed-out number (3) and cross out all of its multiples. Some of them will already be crossed out. You can stop by the time you get to eight. All of the uncrossed-out numbers are prime.
All of those numbers have an infinite amount of multiples.
Write out the numbers 1 to 50 in 5 rows. Cross out 1. Start at 2 and cross out multiples of 2. That would eliminate all the rest of the even numbers. Go to the next uncrossed-out number (3) and cross out all of its multiples. Some of them will already be crossed out. You can stop by the time you get to eight. All of the uncrossed-out numbers are prime.
The prime numbers (factors) of 50 are: 2 and 5
The prime numbers (factors) of 50 are: 2 and 5
There are three numbers between 10 and 50 which are divisible by both 3 and 5. All numbers that are multiples of 3 and 5 are the multiples of the lowest common multiples (lcm) of 3 and 5 which is 15. The multiples of 15 between 10 and 50 are {15, 30 and 45}, thus there are 3 numbers.
There are 15 prime numbers up to 50.
The prime numbers between 31 and 50 are 37,41,43,47.
There are 15 prime numbers less than 50.