lengmoke

@echo off
setlocal enabledelayedexpansion
set start=13
set "numbers= "
for /l %%i in (1,1,30) do (
    if !start! equ 31 ( set /a start=1 )
    set numbers=!numbers!!start! 
    set /a start+=1
)
set /a n=1
:loop
if "%numbers:~4%" neq "" (
    for %%i in (%numbers%) do (
        if "!n!" equ "3" ( set "numbers=!numbers: %%i = !" & set /a n=1 )
        set /a n+=1
    )
    goto :loop
)
echo %numbers: =%
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