Is there a pattern in Pythagorean Triples?

Let's look at the first 5 Pythagorean Triples:

3-4-5, 5-12-13, 7-24-25, 9-40-41, 11-60-61

Are you noticing a pattern here?
The first number in each triple is just 3, 5, 7, 9, 11, adding 2 each time.
The second number in each triple is 4, then 12 (adding 8), then 24 (adding 12), then 40 (adding 16), then 60 (adding 20). You add 4 to the number you add to the number every time.
The third number in each triple is always just the second number + 1.
Here is a Python 3.4 algorithm to simulate this (sorry for bad quality).
By this algorithm, the 1,000,000th Pythagorean triple is (drumroll please) 2,000,001-2,000,002,000,000-2,000,002,000,001!
Please let me know if you can find a proof for this algorithm.

Note by Stefan Popescu
3 years ago

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Look up Euclid's formula. In your case, you are increasing mm by a value of 1 at every step, and you set n=1n=1.

Pi Han Goh - 2 years, 12 months ago

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thank you!

Stefan Popescu - 2 years, 12 months ago

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