Odd Day

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!


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.
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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?
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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.

:-)
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