Project Euler 26

gistfile1.rb

require 'Prime'
max, answer = 0, 0
Prime.each(1000).to_a.reject{|p| p == 2 || p == 5}.each do |p|
  a, c = 10, 1
  while a % p != 1 do
    c += 1
    a *= 10
  end
  max, answer = c, p if max < c
end
puts answer # 983