excel - How to remove used numbers from a list -


i must review number of lists check used numbers. these lists contain values 1 10000 numbers not issued in order. have checked duplicate numbers , don't exist. example i've included first 20 records of 1 list here explanation.

enter image description here

working through manually want end with:

2 3 4 14 20

as these numbers have not been used on right hand list. there way achieve in excel (or similar) i'm stumped on how check 1 list against without having set form of dev environment build application compare lists? thanks

it may easier think in terms of "from lista not in listb" rather "what not in listb in lista". if longer list in columna , shorter in columnb then: 

=index(a:a,match(a1,b:b,0))

copied down suit return values in found in b, , not found return "#n/a" and, if placed in correct row, values missing b shown in column of corresponding row.

for removal, filter columnb select other blanks , delete shows (will delete elements of columna in process, maybe work on copy).


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