Question 1189967
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(1)   First,  turn each digit upside down.


(2)   Next,   in each two-digit number,  obtained this way, reverse digits.


(3)   Finally,  read the obtained sequence and guess the missed number.



                        It is  87.



With this number,  87,  make inverse transformations.



                        E N J O Y  ( ! )



This puzzle is as old as Arabic numerals,  perhaps . . . 



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The second number in your sequence, namely the number 6, is presented incorrectly : 

it breaks the hidden logic of the puzzle . . . 



It is typical at this forum :   I rarely see a correctly written post here . . . 


When I see a correctly presented problem,  it is like a fiesta for me. . .