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# File lib/prime.rb, line 431
    def initialize # :nodoc:
      # bitmap for odd prime numbers less than 256.
      # For an arbitrary odd number n, @tables[i][j][k] is
      # * 1 if n is prime,
      # * 0 if n is composite,
      # where i,j,k = indices(n)
      @tables = [[0xcb6e, 0x64b4, 0x129a, 0x816d, 0x4c32, 0x864a, 0x820d, 0x2196].freeze]
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