题目224：准直角三角形（二）
Almost right-angled triangles IILet us call an integer sided triangle with sides a ≤ b ≤ c barely obtuse if the sides satisfy
a2 + b2 = c2 - 1.
How many barely obtuse triangles are there with perimeter ≤ 75,000,000?
题目：
如果整数边长三角形的三条边 a，b，c 满足 a ≤ b ≤ c 且 a2 + b2 = c2 - 1，则称之为“刚好钝角三角形”。
那么，周长 ≤ 75,000,000 的“刚好钝角三角形”有多少个？
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