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**individ****Member**- Registered: 2014-03-16
- Posts: 331

https://math.stackexchange.com/question … 71#3214271

Use another equation.

And we use solutions to the Pell equation.

any number.Decisions then write down so.

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**individ****Member**- Registered: 2014-03-16
- Posts: 331

https://mathoverflow.net/questions/3343 … 624#334624

To solve the Diophantine equation. Where

is any given number...Solutions can be expressed through the following solutions to the Pell equation.

And then the decisions can be recorded...

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**individ****Member**- Registered: 2014-03-16
- Posts: 331

https://math.stackexchange.com/question … y2-a2ab-b2

Solution of equation.

Can be written using solutions to the Pell equation....

Knowing the first solutions for....

The following can be found by the formula.

Will make a replacement for the simplified entry....

And then the solutions of the equation can be written in the form...

So the Pell equation has infinitely many solutions, it means for any number - solutions will always be and infinitely many.

*Last edited by individ (2019-07-03 00:21:35)*

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**individ****Member**- Registered: 2014-03-16
- Posts: 331

A link to the discussion of the equation....

https://dxdy.ru/topic134512.html

I kind of wrote 5 parametric solution.

For the case when

or .... get the formula for 4 cubes...*Last edited by individ (2019-07-11 16:28:48)*

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**individ****Member**- Registered: 2014-03-16
- Posts: 331

https://math.stackexchange.com/question … s-part-two

*Last edited by individ (2019-09-14 19:35:05)*

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**individ****Member**- Registered: 2014-03-16
- Posts: 331

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**individ****Member**- Registered: 2014-03-16
- Posts: 331

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**individ****Member**- Registered: 2014-03-16
- Posts: 331

https://math.stackexchange.com/question … 86#4039186

To solve the Diophantine equation.

It is necessary to use the solution of the following equation.

There are solutions when the coefficient can be represented as the sum of squares.

And the solution itself can be presented in this form.

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**individ****Member**- Registered: 2014-03-16
- Posts: 331

https://math.stackexchange.com/question … 72#4370472

There are various variants of such equations. For example like this.

https://artofproblemsolving.com/communi … _variables

When solving such equations.

Pythagorean triples can help us. Take any two Pythagorean triples.

Then the solutions can be written in this form. Then the truth needs to be reduced by a common divisor.

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**individ****Member**- Registered: 2014-03-16
- Posts: 331

https://mathoverflow.net/questions/4320 … 221#432221

So the problem boils down to finding solutions to the general Pell equation. Then the problem is just in writing a convenient formula for describing solutions.

In addition to a convenient formula, there is another problem - through which Pell equations these solutions are described. Oddly enough, the usual Pell equation appears everywhere. Of this kind.

And there are two possible options for describing solutions. The first option is to use the standard Pell equation. And use such formulas, for example.

https://artofproblemsolving.com/community/c3046h1049910

https://artofproblemsolving.com/community/c3046h1048219

I don't particularly like these formulas. In order to use them, it is necessary to solve the Pell equation. Therefore, it was a question of using solutions of the general and standard Pell equations. That's strange. that it is always necessary to use the standard Pell equation to find solutions.

Since the square shape can always be reduced to the general Pell equation.

Using solutions of the standard Pell equation.

And using solutions of the general Pell equation.

You can write a formula for finding the next solution using the previous ones.

It was interesting, and if you don't do transformations, write an explicit formula. Will the same pattern persist in this case?

You still need a general equation.

And the standard equation.

Solutions can be written like this.

To obtain all solutions sequentially. They are usually used in the formula of the first solutions and going consistently to the big ones. Although formally, any solutions can be used in these formulas. For any solutions, the formula works.

The interesting thing is that no matter how the form of the general Pell equation changes. The form of solutions to this equation will be given by the standard Pell equation.

*Last edited by individ (2022-10-11 00:14:09)*

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**individ****Member**- Registered: 2014-03-16
- Posts: 331

http://math.hashcode.ru/questions/24950 … вное-число

Решений можно записать два. Одно когда взаимно простые....

Сумма их имеет вид.

И когда нет...

Ну и дальше всё совсем просто... взаимно простые когда скобки некоторые равны 1... ну или -1

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