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http://rubytu.be/
http://teachmetocode.com/screencasts/page/3/
def get_triangle_number(divisors)
puts Time.now
number = 1
found = false
until found
first_number_primes = get_primes(number)
second_number_primes = get_primes(number + 1)
primes = first_number_primes | second_number_primes
triangle_number = ( number * (number + 1) ) / 2
prime_times = times_each_prime(triangle_number, primes)