Generating random binary number with X ones

        local ones = 13 + rnd(5) --Generating number with 14, 15, 16, 17 or 18 ones
        for bitn = 32, 1, -1 do
            local got = 0
            if rnd(bitn) <= ones then
                got = 1
            end
            ones = ones - got
            num = bit.rol(bit.bor(num, got), 1)
        end
        print("num", bit.tohex(num))