What is the similarity in the following numbers 85, 17, 19, 4, 2?

They are all deficient numbers, that is, the sum of each number's proper divisors is less than the number. Also, each number is relatively prime with the sum of its divisors.
For each nn in the list, 2n+32n+3 is a prime. Also, n2+(n+1)2n2+(n+1)2 is prime.
All of these numbers are of the form 2j+3k2j+3k .