This is a pseudo code for a C++ program that displays all prime numbers having 3 digits and starting with 5
Intialize factors to 0
Create an empty vector called 'primenumbers'
For number ranging from 500 to 599, inclusive
    For i ranging from 1 to number, inclusive
        if number is divisible by i, increment factors by 1
    if factors is less than or equal to 2, insert number to primenumbers
    set factors to 0
For j ranging from 0 to the size of 'primenumbers', exlusive
    print the j-th element of 'primenumbers'
End