I wrote a CMIMC problem this year

by djmathman, Apr 19, 2024, 12:49 PM

Combo/CS 1. For each positive integer $n$ (written with no leading zeros), let $t(n)$ equal the number formed by reversing the digits of $n$. For example, $t(461) = 164$ and $t(560) = 65$. For how many three-digit positive integers $m$ is $m + t(t(m))$ odd?

I wonder how many people got the reference/"point" of the problem during the test. (In particular, that second example uses a particularly specific number....)
This post has been edited 1 time. Last edited by djmathman, Apr 19, 2024, 12:51 PM

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This is your comeback at the 065 problem on the AMC's isn't it :D

To be clear, I did write the 065 problem too, so it's maybe a bit of self-deprecation :') ~dj
This post has been edited 1 time. Last edited by djmathman, Apr 19, 2024, 12:52 PM

by fruitmonster97, Apr 19, 2024, 12:50 PM

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I am proud to say that I got the reference and solved it in contest

by Amkan2022, Apr 19, 2024, 1:08 PM

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in my test room, a lot of people laughed at the beginning of the combo/cs round because of it lol

by lpieleanu, Apr 19, 2024, 1:38 PM

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me when i solve the 10a problem but forget that $t(t(100))\neq 10$

by plang2008, Apr 19, 2024, 3:56 PM

A blog documenting a (no longer) high school youth and his struggles with advancing his mathematical skill.

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  • dj so orz :omighty:

    by Yiyj1, Mar 29, 2025, 1:42 AM

  • legendary problem writer

    by Clew28, Jul 29, 2024, 7:20 PM

  • orz $$\,$$

    by balllightning37, Jul 26, 2024, 1:05 AM

  • hi dj $ $ $ $

    by OronSH, Jul 23, 2024, 2:14 AM

  • i wanna submit my own problems lol

    by ethanzhang1001, Jul 20, 2024, 9:54 PM

  • hi dj, may i have the role of contributer? :D

    by lpieleanu, Feb 23, 2024, 1:31 AM

  • This was helpful!

    by YIYI-JP, Nov 23, 2023, 12:42 PM

  • waiting for a recap of your amc proposals for this year :D

    by ihatemath123, Feb 17, 2023, 3:18 PM

  • also happy late bday man! i missed it by 2 days but hope you are enjoyed it

    by ab456, Dec 30, 2022, 10:58 AM

  • Contrib? :D

    by MC413551, Nov 20, 2022, 10:48 PM

  • :love: tfw kakuro appears on amc :love:

    by bissue, Aug 18, 2022, 4:32 PM

  • Hi dj :)

    by 799786, Aug 10, 2022, 1:44 AM

  • Roses are red,
    Wolfram is banned,
    The best problem writer is
    Djmathman

    by ihatemath123, Aug 6, 2022, 12:19 AM

  • hello :)

    by aidan0626, Jul 26, 2022, 5:49 PM

  • Do you have a link to your main blog that you started after graduating from high school, I couldn't find it. @dj I met you IRL at Awesome Math summer Program several years ago.

    by First, Mar 1, 2022, 5:18 PM

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