This week's maths problem

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Problem of the week

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On Friday of each week we will post a new maths challenge.
You may submit your solution by the following Thursday.
Each problem contains two different levels of difficulty. You will be awarded from 2 to 12 points for a full answer.
Each series contains 12 problems before the stage winner is determined.
Your score will be published here.

In each series we will give away 3 books as prices. The prices will be drawn by lot among the best ten participants of the series. The books are kindly sponsored by Buchdienst Rattei of Chemnitz.

Suggestions for problems are welcome.

Deadline is 10nd of September 2020.

German version - Italian version - French version - Spanish version  Hungarian Version

Series 54

problem 647

summer break

“We all know that there are whole numbers (greater 0) which are x² + y² = c². We also know that there is no whole number (greater 0), so that x³+y³ = z³ applies.“, Bernd’s and Maria’s grandpa said. “However, you can find positive integers for a³ + b³ + c³ = d³ and even for a³ + b³ + c³ + d³ = e³, that fulfill the equation. You have to try it“, grandpa told them.
For finding the numbers you will get 5(=2+3) blue points.
For finding a, b and c (positive integers) in the following equations you will get 4 points, for each of them:
a³ + (a+b)³ + (a +2b)³ + … +(a+6b)³ = c³
a³ + (a+b)³ + (a +2b)³ + … +(a+7b)³ = c³
a³ + (a+b)³ + (a +2b)³ + … +(a+9b)³ = c³
(tasks out of an “excercise book“ from the year 1971)

-> Enigma <--

https://www.schulmodell.eu/images/stories/mathe/horst/raetsel.php

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adress:
Thomas Jahre
Stollberger Strasse 25
09119 Chemnitz
Germany

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