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
Between 65 and 105, there are three twin prime pairs: (71, 73), (101, 103). Twin primes are pairs of prime numbers that differ by two, and these pairs are the only ones within the specified range.
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