Prometheus

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-- print first n primes
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local function primes(n)
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    local function isPrime(n)
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        for i = 2, math.sqrt(n) do
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            if n % i == 0 then
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                return false
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            end
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        end
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        return true
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    end
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    for i = 2, n do
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        if isPrime(i) then
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            print(i)
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        end
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    end
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end
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primes(20)