2 x 3 x 5 = 30
2x3x5
The longest string of prime factors for 30 is 2 x 3 x 5 because there isn't a prime factor string that's longer.
the longest string of prime factor for 30 is 2 x 3 x 5
The longest factor string of 30 is 2 x 3 x 5.
The prime factorization.
The prime factorization.
When all the factors are prime.
For composite numbers, only one string of factors is the longest; the prime factorization.
When all of the factors are prime. The longest factor string is the prime factorization.
Find the prime factors first.
The longest factor string for 840 is its prime factorization because prime factors can't be broken down any further.
Because 1 isn't prime.