gistfile1.builder

=begin 
prime = Array.new
count = 1
prime[0] = 2
prime[1] = 3
no = 5
sum = 5
while no<2000000
	for i in (1..count)
		break if (no % prime[i] == 0)
	end
	if (i == count)
		count += 1
		prime[count] = no
		sum += no
	end
	no += 2
end
print sum
=end

sum = 5
no = 5
while no <2000000
	i = 3
	until i*i>no
		break if (no%i==0)
		i+=2
	end
	sum += no if (i*i>no)
	no += 2
end
print sum