Odd Day

By Miss Cellania in Everything Else on May 4, 2009 at 9:23 am

odd characters

Ron Gordon, the California teacher who founded and promoted Square Root Day reminds us that Thursday is another math holiday, Odd Day! The calendar date (as written by people in the US) will be 5-7-9, which only happens once a century. Odd Days happen six times a century. It’s a day to take the opportunity to do something odd. In celebration, there’s another contest, with $579 up for prizes. Get all the details at the Odd Day website. Link -Thanks, Ron!


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  1. Miss Cellania
    May 4th, 2009 at 9:25 am

    I know he’s going to give all that money away, because I was one of the winners of the Square Root Day contest!

    http://www.misscellania.com/miss-cellania/2009/5/4/math-holidays-pay-o ff.html

  2. Rich
    May 4th, 2009 at 10:41 am

    And yet no one has mentioned today is “Star Wars Day” That’s kinda odd… innit?

  3. Sean
    May 4th, 2009 at 2:32 pm

    Actually, it’s not ‘Odd Day’ at all, because the year, 2009, has three even digits in it. If I remember correctly, the last true ‘Odd Day’ was November 19, 1999, the last date where all the digits of the date are odd for more than a millennium, the next one being January 1, 3111.

  4. Ashley
    May 4th, 2009 at 8:04 pm

    What makes 5-7-9 more special than 3-5-7, or 1-3-5, or especially 11-11-11?

  5. Miss Cellania
    May 4th, 2009 at 8:05 pm

    Ashley, those dates were celebrated, too.

  6. DOJ
    May 4th, 2009 at 9:13 pm

    only six times a century?

    why not 11 times just this month?

  7. BABZ
    May 7th, 2009 at 8:36 am

    Ok, so what really defines an Odd day. I don’t understand why 5-1-9 or any of the other odd numberd days of odd numbered months are not considered Odd day? What makes 5-7-9 more special that the others?

  8. Mere
    May 7th, 2009 at 9:59 am

    Its more special because the numbers are in consecutive order, not just any three odd numbers.

  9. Darryl
    May 7th, 2009 at 12:08 pm

    What occured on my birthday 1-3-57 ? People have told me that I’m different.

  10. don cochrane
    May 7th, 2009 at 12:18 pm

    I have been celebrating regularily during the millennium.

    The next time to celebrate will be 9/9/9
    (three identical; where the square root is odd and prime) and then 11/11/11 (three identical primes).

    I fondly remember 1/1/1, 3/3/3, 5/5/5, 7/7/7…. now those were some good identical prime parties.

    :-)

  11. Rosemarie Ryan
    May 7th, 2009 at 12:25 pm

    Happy Odd Day! Yes, I will be celebrating…it’s my BIRTHDAY and I’m ODD!

  12. crazzeecat
    Jul 8th, 2009 at 1:25 pm

    What about my birthdate?09/15/1955


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