Re: 2025: Division by digit removal.

Am 02.01.2025 um 17:13 schrieb sobriquet:

Op 01/01/2025 om 16:23 schreef Alan Mackenzie:

The year is now 2025.
>
2025 is divisible by 9.  To do this, you merely have to remove the digit
0, leaving 225.
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225 is also divisible by 9.  Again, remove one of the 2 digits, leaving
25.
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25 is divisible by 5.  Guess what, to do this you remove the 2 digit
leaving 5.
>
Well, that's as far as it goes.
>
Happy new year to you all!
>

 https://www.wolframalpha.com/input?i=%28sum+n%3D1+to+9+n%29%5E2
 https://www.wolframalpha.com/input?i=+sum+n%3D1+to+9+n%5E3

Jeah,
2025 = (1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9)^2 = 1^3 + 2^3 + 3^3 + 4^3 + 5^3 + 6^3 + 7^3 + 8^3 + 9^3.