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Brachylog, 14 bytes

;İ{N≜↔;?≠}f(tt

Explanation

; { }f( -- Find the first n
 İ -- numbers which
 N -- is positive
 ≜ -- make explicit (otherwise it will only try one number of each length)
 ↔ -- which if reversed
 ;?≠ -- is equal to itself
 tt -- return last one

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