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tomfa/Project Euler #28

Created April 25, 2020 19:55
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Project Euler #28
def numbers(width):
assert width % 2 == 1, "Need odd numbered size"
sum = 1
last_number = 1
i = 3
while i <= width:
sum += last_number * 4 + (i - 1) * 10
last_number += (i - 1) * 4
i += 2
return sum
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