1.1 KiB
1.1 KiB
id | challengeType | title | forumTopicId |
---|---|---|---|
5900f5111000cf542c510023 | 5 | Problem 420: 2x2 positive integer matrix | 302090 |
Description
We define F(N) as the number of the 2x2 positive integer matrices which have a trace less than N and which can be expressed as a square of a positive integer matrix in two different ways. We can verify that F(50) = 7 and F(1000) = 1019.
Find F(107).
Instructions
Tests
tests:
- text: <code>euler420()</code> should return 145159332.
testString: assert.strictEqual(euler420(), 145159332);
Challenge Seed
function euler420() {
return true;
}
euler420();
Solution
// solution required