Lua孪生素数：相邻差2的素数配对

local function isPrime(n)
    if n < 2 then return false end
    local i = 2
    while i * i <= n do
        if n % i == 0 then return false end
        i = i + 1
    end
    return true
end

local function twins(lo, hi)
    local out, prev = {}, 0
    for n = lo, hi do
        if isPrime(n) then
            if prev > 0 and n - prev == 2 then
                out[#out + 1] = prev .. "+" .. n
            end
            prev = n
        end
    end
    return out
end
local p = getplayerbyname("tw01")
sendmsg(p, 1, "100 以内 " .. #twins(2, 100) .. " 对")