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local nums = {} local s; local n; local m; local lim local yorn print(os.date("Today is a %A, in %B")) io.write("Enter limit for this search (empty for default): ") lim = tonumber(io.read()) if lim == nil then lim = 100000000 end s = math.sqrt(lim) local tStart = os.time() for n = 1, lim do nums[n] = false end for n = 2, s do if nums[n] == false then m = n * n while m <= lim do nums[m] = true m = m + n end end end print("It took " .. (os.time() - tStart) .. " seconds to complete.") io.write("Do you want to list results (Y/N)? ") yorn = io.read() if yorn == "Y" or yorn == "y" then print("The primes up to " .. lim .. " are: ") else print("(please wait for count...)") end m = 0 for n = 2, lim do if nums[n] == false then if yorn == "Y" or yorn == "y" then print(n) end m = m + 1 end end print("") print("Total primes = " .. m)
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