欧拉计划 发表于 2017-1-5 16:07:59

题目223:准直角三角形(一)

Almost right-angled triangles I

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?

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“刚好锐角三角形”。

那么,周长 ≤ 25,000,000 的“刚好锐角三角形”有多少个?




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