36 lines
801 B
Text
36 lines
801 B
Text
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#!/usr/bin/env luajit
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local primes = require 'primes'
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local arrr = require 'arrr'
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local parser = arrr {
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{ "Enable batch factorization", "--batch", "-b" };
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{ "Initialize prime table up to the Nth prime", "--initialize", "-n", "n", tonumber };
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}
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local options = parser {...}
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if options.initialize then
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for i=1, options.initialize do
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local _ = primes[i]
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end
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end
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if not options.batch then
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local number = options[1] and tonumber(options[1])
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if not number then
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io.write("Please input a number: ")
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number = assert(tonumber(io.read())) -- Try 351681238432 ;)
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end
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for i, factor in ipairs{primes:factorize(number)} do
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print(factor)
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end
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else
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for number in io.lines() do
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number = assert(tonumber(number))
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print(number.." = "..table.concat({primes:factorize(number)}, " + "))
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end
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end
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