8, 11, and 20.
The prime factors of 20 are 2x2x5.
The prime numbers of 20 are 2, 2 and 5. (2*2*5 = 20)
There are two prime numbers between 20 and 30 which are 23 and 29
The prime numbers between 20 and 30 are 23 and 29.
It is 1.
These are the prime numbers 1-20 2,3,5,7,11,13,17,19
8, 11, and 20.
Both 10 and 20 are two-digit numbers that are factors of 20.
2/5 of the numbers from 1 to 20 are prime numbers
The prime factors of 20 are 2x2x5.
10 and 20 are composite numbers, not prime numbers. The prime factorization of 10 is 2 x 5. The prime factorization of 20 is 2 x 2 x 5.
The prime numbers of 20 are 2, 2 and 5. (2*2*5 = 20)
The only even prime number is 2. It happens twice in the prime factorization of 20.
There are two prime numbers between 20 and 30 which are 23 and 29
The prime numbers between 20 and 30 are 23 and 29.
You know that the odd digits have to be in the units places, and the evens in the tens place, so the general solution is: 80 + 60 + 40 + 20 + 9 + 7 + 3 + 1 = 220