@echo off&setlocal EnableDelayedExpansion

for /l %%a in (101 1 200) do (

  set /a n=%%a-1&set "flag="

  for /l %%b in (2 1 !n!) do (

    set /a m=%%a%%%%b

     if !m! equ 0 set flag=a

  )

  if not defined flag echo 素数 %%a

)

echo\&pause
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@echo off&setlocal EnableDelayedExpansion

for /l %%a in (101 2 200) do (

  set "flag="

  for /l %%b in (3 2 15) do (

    set /a m=%%a %% %%b

     if !m! equ 0 set flag=A

  )

  if not defined flag echo 素数 %%a

)

echo\&pause
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@echo off&setlocal EnableDelayedExpansion
set "th=1"&set /p=请输入一个数:
for /l %%i in (1,1,!p!) do (
  set "str=!str!1"
)
rem 也可以加上先判断是否偶数。
for /l %%i in (3,2,!p!) do (
    set "th=!th!11"
    for /f %%j in ("!th!") do (
        if "!str:%%j=!"=="" set "flag=非素"&goto :end
    )
)
:end
if defined flag (
  echo 非素数
) else (
  echo 素数
)
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@echo off&setlocal enabledelayedexpansion >素数.tmp 3>素数.tmp
echo 2
for /l %%a in (3 2 200) do (
   for /f %%b in (素数.tmp) do set /a "test=1/(%%a%%%%b)"||set tmp=%%a
   if %%a neq !tmp! echo %%a
) 2>nul
type>con 素数.tmp
pause
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