local max_factors = {} for _, prime in ipairs({2, 3, 5, 7, 11, 13, 17, 19}) do for i = prime, 20, prime do local num_fact = 0 local tmp = i while i % prime == 0 do num_fact = num_fact + 1 i = i / prime end if num_fact > (max_factors[prime] or 0) then max_factors[prime] = num_fact end end end local total = 1 for prime, power in pairs(max_factors) do total = total * prime^power end print(total)