Count from 20-100

Question

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I use Jupiter to read a CSV file. Then, in a specific column, I read all the numbers, from 20 to 100. I want to go through the whole column and see if there is a sequence of numbers running from 20 to 100 in jumps of 5: 20,25,30,35..95, and 100. If this happens, the count goes up by 1.

index = 20
count = 0
i = 0
while i < len(nparr):
    if nparr[i] == index:
        if index == 100:
            count += 1
            index = 20
            i+=1
        else:
            while nparr[i] == index:
                i +=1
                index +=5
    else:
        index = 20
        i+=1
count

The output should be 1 Right Now, I get 0