gistfile1.txt

sine:~% ruby primetester.rb
Rehearsal ------------------------------------
  2.980000   1.160000   4.140000 (  4.164864)
--------------------------- total: 4.140000sec

 Primesum: 496165411

       user     system      total        real
  2.940000   1.180000   4.120000 (  4.139064)

 Primesum: 496165411

primetester.rb

primesbool = Array.new(1000000)

primesum = 0

primesbool[0] = true

for i in 1..(Math.sqrt(1000000.to_f))
  unless primesbool[i]
    j = (2 * (i+1))-1
    loop do
      break unless j < 1000000
      primesbool[j] = true
      j += i+1
    end
  end
end

j = 0
i = 0
loop do
  break unless i < 1000000 && j < 10000
  unless primesbool[i]
    primesum += i+1
    j += 1
  end
  i += 1
end

puts "Primesum: #{primesum}"