Slashdot Mirror


This Rare Friday the 13th

Juha-Matti Laurio writes to point out a Washington Times story about how special this particular Friday the 13th is. The digits in the numerical notation for the date add up to 13 — whether you write it in the US or the European form. From the article: "The phenomenon hasn't happened in 476 years, said Heinrich Hemme, a physicist at Germany's University of Aachen who crunched the numbers to find that the double-whammy last occurred Jan. 13, 1520."

26 of 239 comments (clear)

  1. I Just Knew I Shoulda Stayed In Bed Today by ackthpt · · Score: 4, Funny

    While the sum of 2+6+1+1+3=13 is mildly interesting, I never thought much about Friday the Thirteenth outside of Pogo strips. Walt kelly's character in the strip, Churchy LaFemme perhaps more than any other source kept the Friday the Thirteenth fear alive as the turtle fled in horror for decades, long before the series of films arrived. For those of us who remember (and in some cases still read) the strip, it's still a source of amusement.

    "Don't shoot! Don't shoot! It's Friday the thirteenth! Very unlucky to get shot on Friday the thirteenth!"

    2+6+1+1+4=14, so there goes Saturday the 14th too.

    --

    A feeling of having made the same mistake before: Deja Foobar
    1. Re:I Just Knew I Shoulda Stayed In Bed Today by enjerth · · Score: 5, Funny

      Yeah, and it's amazing that it still adds up to 13 if you switch the numbers around, 1+1+3+2+6 = 13. WOW!

  2. Commutivity by P(0)(!P(k)+P(k+1)) · · Score: 5, Funny

    From TFS:

    The digits in the numerical notation for the date add up to 13—whether you write it in the US or the European form.
    What a relief! I always suspected that the commutativity of addition applied on both sides of the Atlantic.

    Or did they mean to imply that the dæmons who govern paraskevidekatria are too preoccupied to uphold mathematical principles today?

    In a related article:

    Thirteen people, pledged to eliminate triskaidecaphobia, fear of the number 13, today tried to reassure American sufferers by renting a 13ft plot of land in Brooklyn for 13 cents (10d) a month. (Daily Telegraph, 1967)
    1. Re:Commutivity by ackthpt · · Score: 2, Funny

      What a relief! I always suspected that the commutativity of addition applied on both sides of the Atlantic. Or did they mean to imply that the dæmons who govern paraskevidekatria are too preoccupied to uphold mathematical principles today?

      If you're in Europe, then you're in luck. It's the 14th already.

      --

      A feeling of having made the same mistake before: Deja Foobar
    2. Re:Commutivity by fuzzix · · Score: 5, Funny
      Speaking of adding:

      "The phenomenon hasn't happened in 476 years, said Heinrich Hemme, a physicist at Germany's University of Aachen who crunched the numbers to find that the double-whammy last occurred Jan. 13, 1520."
      ...someone can't. Or is it 1996? :)
    3. Re:Commutivity by Anonymous Coward · · Score: 0, Funny
      *sigh*

      1520 + 476 = 1996...
      Nonono, he can't subtract. Clearly, he couldn't have known the number 476 before he computed the years. Addition has nothing to do with! ;-)
    4. Re:Commutivity by nebaz · · Score: 2, Funny

      I can imagine what someone would say about the parent being 'Informative' during metamoderation. :-)

      Hmm... a post showing the sum of two numbers.

      --
      Rhymes that keep their secrets will unfold behind the clouds.There upon the rainbow is the answer to a neverending story
    5. Re:Commutivity by Filthysock · · Score: 2, Funny

      1582, never forget.

  3. 13th Post! by markana · · Score: 5, Funny

    sorry....

    1. Re:13th Post! by rolfwind · · Score: 5, Funny

      Yep, you hit it. I viewed at -1 Flat, and counted, you are indeed the 13th post.

      Congratulations. You have reached the pinnacle of your life.

  4. Pffft.... by yo303 · · Score: 5, Funny
    It's bad luck to be superstitious.

    yo.

  5. Mod Parent Down by s-gen · · Score: 5, Funny

    Just to prove to him its not his lucky day.

  6. Re:European Dates by Anonymous Coward · · Score: 1, Funny

    well, maybe so, but to an american, anything non-american is "european". which also means randomly different, but not so much that it matters unless you are also european yourself.

    sorry -- americans are like that.

  7. Re:paraskevidekatriaphobics - a new word by mattmacf · · Score: 5, Funny

    Halloween, however, is celebrated on October 31, therefore, it's only superstitious for those crazy Europeans who insist on writing the date backwards.

    ; D

    --
    I only mod funny =D
  8. 10 + 13 + 2006 = 2029...these add up to 13 too!! by Cobraman · · Score: 5, Funny

    10+13+2006 = 2029 2+0+2+9 = 13 aaaaaaaaaaaaaaaaaaaaaaaaaaaahhhh! all hell is breaking loose!!!!!!!

  9. Scheiße! by suso · · Score: 2, Funny

    I always confuse Halloween and Christmas.

    - Octo Weinstein

  10. Old news! by Eythian · · Score: 4, Funny

    Slashdot is behind the times again! According to all my calendars, it's been Saturday the 14th for 13 hours already :)

  11. "Pure chance," by Scooter · · Score: 4, Funny

    From TFA:-

    '"Pure chance," the good professor told the press yesterday. '

    Er right then, and there was me thinking the dates were pretty much predictable. I have a sort of flip chart thing on my wall that has successfully predicted all the dates this year - in sequence! It has pictures of cars on it too, which is nice.

  12. Unlucky my ass.. by MioTheGreat · · Score: 3, Funny

    Unlucky my ass. I was #7 for preordering my Wii this morning....

  13. Re:Of course, you care about that only if by Iron+Condor · · Score: 2, Funny

    And for the rest of us, the overwhelming majority of rational folks, [...]

    Wow.

    What country do you live in?

    Can I come?

    --
    We're all born with nothing.
    If you die in debt, you're ahead.
  14. Wasn't this on South Park The other night? by SrLnclt · · Score: 3, Funny

    Cartman: Twelve contains the numbers 1 and 2 just like the toilet yesterday where somebody went #2 instead of #1. Add 2 and 1 with 911 and you get 914. Drop the 4 and its 91. Exactly the score Kyle got on his spelling test 12 days after 9/11!

  15. Re:self-promoting talking head? by Anonymous Coward · · Score: 1, Funny

    By my calculation $457.3 billion dollars are lost in productivity annually by calculating lost productivity statistics.

    (You don't want to know the number for making obvious jokes on slashdot).

  16. Re:I see it as lucky 7 by Anonymous Coward · · Score: 1, Funny

    No, it's 10/13/2006, which is lucky 0.00038346499

  17. Re:10 + 13 + 2006 = 2029...these add up to 13 too! by Anonymous Coward · · Score: 1, Funny

    JJ Abrams called, he wants his calculator back.

  18. Re:Um.. not so phenomenal? by bcat24 · · Score: 4, Funny

    But don't shoot them today! That would just convince more people that Friday the 13th is unlucky.

  19. Re:A physicist? by Anonymous Coward · · Score: 1, Funny

    You don't know the CS grads I work with - many of them would have trouble writing a program to display the current date...