???? ??? ?? 200 ?? 250 ?????? ?? ?????

I didn't understand the question
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I did not know what you are trying to say.
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Please try posting your question again because I am only able to see question marks???
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Seems that your question is incorrect...
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i understood you are asking what would be before 200 and after 250 
so the gap is of 50  then
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50 , 100 ,150 , 200 , 250 , 300 , 350 , 400
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,mnbvbj
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What are you looking for?