Created
April 24, 2016 08:26
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Sieve of Eratosthenes
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def compute(number) | |
sieve((2..number).to_a, [], Math.sqrt(number)) | |
end | |
def sieve(list, primes, stopper) | |
return primes + list if list.first >= stopper | |
primes << list.shift | |
list.reject! { |n| n % primes.last == 0 } | |
sieve(list, primes, stopper) | |
end | |
if ($0 == __FILE__) | |
puts compute(ARGV.first.to_i).join(', ') | |
end |
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