11 because it cannot be divided by anything other than 1 and itself.
The 5th prime number is 11, and the 5th Fibonacci number is 5.The sum will be 11 + 5 = 16
17The prime numbers between 10 and 20 are 11, 13, 17 and 19. There is only one square number between 10 and 20: 16. Using the criteria given, the number that fits is 17.
Two: 11 and 13
10=2*5 Any number that doesn't have a factor of 2 or 5 is relatively prime to 10. e.g. 3, 7, 11, and 21 are all relatively prime to 10. 2, 5, 15, 16, and 20 are not relatively prime since they share a factor or 2 or 5 (or both, which means they share a factor of 10, e.g. 20).
Even number bigger than two are never prime so cross them out, leaving11,13,15,17,19Any number ending in 5 is divisible by 5 and so can not be prime,This leaves 11,13,17,19 which all could be prime and actually are.
Out of 10, 14, 16 and 24, 16 has one prime factor that repeats.
They are: 2 3 5 7 11 and 13
The next prime number after the composite number of 16 is 17
Small words make a difference. No prime number "has" a factor of 16. But 2 is the only prime number that "is" a factor of 16.
The numbers between 10 and 20 that are not prime are 12, 14, 15, 16 and 18. So 15 is the odd number and the rest are even numbers.
The GCF is 1 ! 11 is a prime number - only having itself and 1 as its factors.
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25