gistfile1.rb

# 
# If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. 
# The sum of these multiples is 23.
# 
# Find the sum of all the multiples of 3 or 5 below 1000.

# puts (1..10).inject{|sum, n| sum + n if (n % 3 == 0 || n % 5 == 0)}

["9", "99", "999", "9999", "99999", "999999", "9999999", "99999999"].each do |num|
  print "NUM: #{num}\n\t"
  print "2"
  print "3"
  if num.length > 1
    if num.length > 2
      print "3"*(num.length - 2)
    end
    print "1" 
    if num.length > 2
      print "6"*(num.length - 2)
    end
    print "8"
  end
  print "\n"

  # puts "\t" + (1..num.to_i).inject(0){|sum, n| (n % 3 == 0 || n % 5 == 0) ? sum + n : sum}.to_s
end