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This was a registration CAPTCHA problem as of 2025:
Among the first 510 thousand square numbers, what is the sum of all the odd squares?
Python solution:
s = 0
for i in range(1, 510001, 2):
    s += i*i
print(s)
At: euler/0.py
Solution:
233168
Articles were limited to the first 100 out of 1965 total. Click here to view all children of Project Euler problem.

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