mountain lion problems

ruby.sh

~ $ /usr/bin/ruby -v
ruby 1.8.7 (2012-02-08 patchlevel 358) [universal-darwin12.0]
~ $ /usr/bin/ruby swag.rb
794
~ $ ruby -v
ruby 1.9.3p362 (2012-12-25 revision 38607) [x86_64-darwin12.2.0]
~ $ ruby swag.rb
787

swag.rb

#! /usr/bin/ruby

def find_sum_factorial
  k = 1
  while true
    k += 1
    sum = sum_digits(factorial(k))
    if sum == 8001
      puts k
      break
    end
  end
end

def factorial(n)
  n.downto(1).inject(:*)
end

def sum_digits(n)
  n.to_s.split(//).reduce(0) {|sum, i| sum + i.to_i}
end

find_sum_factorial

Looks like this is an issue w/ BigNum in Mountain Lion

http://stackoverflow.com/questions/12009799/exponentiation-in-ruby-1-8-7-returns-wrong-answers

http://openradar.appspot.com/11806241