-- 5.宣告一個function，輸入一個正整數，顯示所有小於等於該正整數的質數，若輸入的數非正整數要報錯
-- ex:
-- input : 5
-- return : 1,2,3,5
-- input : 10
-- return : 1,2,3,5,7
-- input : "a"
-- return : "Error, input must be a positive integer"

function Prime_number(x)
    s = true
    for i = 2, x-1, 1 do
        if(x%i==0)
        then
            s = false
        end    
    end
    return s
end

-- Prime_number(11)


function EX_5(n)
    if(type(n) == "number" and n > 0 and n%1==0)
    then
        local P = {1}
        for j = 2, n, 1 do
            if(Prime_number(j))
            then
                table.insert(P, j)
            end
        end
        print(table.concat(P,","))
    else
        print("Error, input value must be a positive integer.")
    end
    return P
end


EX_5(123)
EX_5(asd)