yuhaodong

@echo off
:loop
set /a n=2
set /p a=请输入该规律的第几个数
set /a c=2+(%a%-1)*3
cls
echo 该规律的第%a%个数:%c%
pause
goto loop

xxx3212

@echo off&setlocal ENABLEDELAYEDEXPANSION
for /l %%i in (1,2,7) do set/a var+=1&set/a num=!var!+%%i& echo !num!
pause
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