There are 143 prime numbers, and a few thousand composite numbers. It has been known that the largest prime number is 433, so 143 isn’t a prime number. For example, the smallest prime number that can be written as a product of two primes is 7, and the most prime number is 143. But these numbers aren’t really prime in the mathematical sense.

What really makes a prime is the number of factors that it has, not the prime itself. So 143 has 2 factors. The number of times that a number can be divided into two primes is called the gcd. For example, 83, 143, and 433 are divisible by 2, 3, and 4 respectively.

But, but, but, in this case the gcd is 4, while the factors of 143 are 2 and 3. So we have 4 factors in 143 and 4 factors in 83, 143, and 433.

For the numbers we have, the gcd is 4. For the number 143, 143 = 43 + 43 = 43 + 43. We also have 3 factors in 143: 3 = 3, 2 = 2+2 = 4, 1 = 1+1 = 3. This means that 143 = 43 + 43 + 3 = 43 + 43 + 4 = 43 + 40 = 141. And we have 2 factors in 83: 2 = 2, 1 = 3.

So that leaves us with 2 factors in 83 2 2, 1 3 and 143 3 3 43 43. 143 43 is the gcd of 83 and 143 is the gcd of 83 and 143. So 143 is a prime number.

The gcd of all prime numbers is 4 because there are 4 prime numbers that divide it. The gcd of all prime numbers is also 4 because there are 4 prime numbers that divide each one of them. The gcd of all prime numbers is also 4 because there are 4 prime numbers that divide each one of them.