WHY

@echo off & setlocal enabledelayedexpansion
set s=101,102,339,340,341,342,343,592,593,594,595
for %%i in (1a %s% a) do (
    set /a "1/(%%i-a-1)" && set "str=!str!!a!,%%i-"
    set "a=%%i"
)2>nul
echo;!str:~3,-3!
pause
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