sample/sieve.rb


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# sieve of Eratosthenes
sieve = []
unless max = $ARGV.shift; max = 100; end
max = max.to_i

print "1"
for i in 2 .. max 
  protect
    for d in sieve
      fail if i % d == 0
    end
    print ", "
    print i
    sieve.push(i)
  resque
  end
end