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 17nd of June 2021.

German version - Italian version - French version - Spanish version  Hungarian Version Russian version  --> 中文/Chinese <--

Series 57

problem 679

„This year had different dates, which look like a palindrome: 1.2.21, 12.1.21 as well as 12.02.2021. They have 4, 5 or even 8 digits.“, Bernd's grandpa said.
4 digits → structure T.M.JJ, 5 digits → structure TT.M.JJ and 8 digits TT.MM.JJJJ.
Which dates in 2021 are also possible as a palindrome? It doesn't matter if they are already over or still yet to come. - 5 blue points.
You have to write down all dates (only TT.MM.JJJJ), which are palindromes and can be found between the years 2000 and 2100. - 5 red points.
 

-> Enigma <--

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

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adress:
Thomas Jahre
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