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Almost right-angled triangles I

Problem 223

Published on 26 December 2008 at 05:00 pm [Server Time]

Let us call an integer sided triangle with sides a ≤ b ≤ c barely acute if the sides satisfy
a2 + b2 = c2 + 1.

How many barely acute triangles are there with perimeter ≤ 25,000,000?


Answer:
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