mkl

@echo off
setlocal enabledelayedexpansion
set q=1
for /l %%i in (1,1,30) do (
set/a q=!q!*2
set %%i=!q!
)
:re
set h=0
set/a a+=1
set b=%a%
:sum
set/a h=%h%+%b:~0,1%
set b=%b:~1%
if not "%b%"=="" goto sum
if not !%h%!==%a% goto re
echo %a%
pause
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