50
There are three base pairs in each amino acid. If you have 1500 base pairs you would have 500 amino acids.
420 has four prime factors. Prime factors don't usually travel in pairs.
They are 239 prime numbers less than 1500.
43
6
One pair: it's a prime number.
There are three pairs.
2 and 3 are the 1st pair
41,2
There are two pairs of prime numbers that express 18 as the sum of two prime numbers: 7 + 11 = 18 and 5 + 13 = 18.
As a product of its prime factors: 2*2*5*5 = 100
There are 35 pairs of twin prime numbers totaling 69 numbers (prime number 5 appears twice in the twin pairs) between 0 and 1000.