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Re: [PrimeNumbers] Re: Easily memorized primes

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  • Ali Adams
    911 :)   Ali Adams ________________________________ From: djbroadhurst To: primenumbers@yahoogroups.com Sent: Wednesday, September
    Message 1 of 16 , Sep 2, 2009
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      911 :)
       
      Ali Adams




      ________________________________
      From: djbroadhurst <d.broadhurst@...>
      To: primenumbers@yahoogroups.com
      Sent: Wednesday, September 2, 2009 5:35:20 PM
      Subject: [PrimeNumbers] Re: Easily memorized primes

       
      --- In primenumbers@ yahoogroups. com,
      "robert44444uk" <robert_smith44@ ...> wrote:

      > I think it is a bit sad that 11092001 is a prime.
      > As a UK date it tells a story.

      20032003 is a composite number that is hard for me to forget:
      http://tech. groups.yahoo. com/group/ primenumbers/ message/11863

      David







      [Non-text portions of this message have been removed]
    • Walter Nissen
      Hi , all , There may be several different challenges here . ... This is more of an expression than a numeral . ... Yes , but it fails to comply with ISO 8601 ,
      Message 2 of 16 , Sep 2, 2009
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        Hi , all ,

        There may be several different challenges here .

        > 10^700+7
        This is more of an expression than a numeral .

        > 11092001 is a prime. As a UK date it tells a story.
        Yes , but it fails to comply with ISO 8601 , and is hence
        obsolete and confusing , just as e-mail dates often are .

        I tend to think of this challenge :
        One may be called upon to name a large prime at a social
        gathering , prototypically a "cocktail party" .
        You may know a large prime , but can you say it ?
        A long string of digits can be hard to speak and even
        harder to understand , so there is a long-standing and
        useful protocol :
        911 can be spoken "nine hundred eleven"
        ( tho nine hundred onety-one would make more sense ) .
        When I write below "123" , I mean
        "one hundred twenty-three" .
        123123456456911 is prime and can be said :
        123 trillion 123 billion 456 million 456 thousand 911 .
        For the more adventurous :
        123123456456789789911 is prime and can be said :
        123 quintillion 123 quadrillion
        456 trillion 456 billion 789 million 789 thousand 911 .

        Cheers ,

        Walter
        http://upforthecount.com
      • djbroadhurst
        ... ............... eleven sextillion one hundred and eleven quintillion one hundred and eleven quadrillion one hundred and eleven trillion one hundred and
        Message 3 of 16 , Sep 2, 2009
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          --- In primenumbers@yahoogroups.com,
          "Walter Nissen" <nissen@...> wrote:

          > You may know a large prime, but can you say it?

          ..............."eleven sextillion
          one hundred and eleven quintillion
          one hundred and eleven quadrillion
          one hundred and eleven trillion
          one hundred and eleven billion
          one hundred and eleven million
          one hundred and eleven thousand
          one hundred and eleven"

          can be said without inhaling

          David
        • Andrey Kulsha
          http://primes.utm.edu/curios/page.php?number_id=811 http://primes.utm.edu/curios/page.php?number_id=846 http://primes.utm.edu/curios/page.php?number_id=629 And
          Message 4 of 16 , Sep 2, 2009
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          • marku606
            ... David stopped at sex and left us almost breathless. But he knows we can have more, much more, with a lot of air to spare. 9 * 10^201 + 1 is prime,
            Message 5 of 16 , Sep 2, 2009
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              --- In primenumbers@yahoogroups.com, "djbroadhurst" <d.broadhurst@...> wrote:
              >
              > --- In primenumbers@yahoogroups.com,
              > "Walter Nissen" <nissen@> wrote:
              >
              > > You may know a large prime, but can you say it?
              >
              > ..............."eleven sextillion
              > one hundred and eleven quintillion
              > one hundred and eleven quadrillion
              > one hundred and eleven trillion
              > one hundred and eleven billion
              > one hundred and eleven million
              > one hundred and eleven thousand
              > one hundred and eleven"
              >
              > can be said without inhaling
              >
              > David
              >

              David stopped at sex and left us almost breathless. But he knows we can have more, much more, with a lot of air to spare.

              9 * 10^201 + 1 is prime, otherwise known as the memorable

              Nine Sexsexagintillion and One.

              If anyone thinks this sounds like

              "Sex, sex again 'till yin and one"

              you're imagining things. Get back to work!


              Mark
            • djbroadhurst
              Suppose that we parse the string cab , in base p, as 12*p^2 + 10*p + 11. Then cab is a prime in the prime base p = 41, where it evaluates to the decimal
              Message 6 of 16 , Sep 3, 2009
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                Suppose that we parse the string "cab", in base p, as
                12*p^2 + 10*p + 11. Then "cab" is a prime in the prime
                base p = 41, where it evaluates to the decimal number 20593.

                Similarly, we may parse the incantation "abracadabra",
                in base p, as 10*p^10 + 11*p^9 + 27*p^8 + 10*p^7 + 12*p^6 + 10*p^5
                + 13*p^4 + 10*p^3 + 11*p^2 + 27*p + 10, which evaluates to the prime
                8510432846378191 in the prime base p = 31.

                The nonce-word "floccinaucinihilipilification" evaluates to the prime
                352402927208050896786973658273234894386040810340804173543364510421
                in the prime base 199. For the meaning, see
                http://www.worldwidewords.org/weirdwords/ww-flo2.htm

                Puzzle: Find the smallest prime base in which Aristophanes' dish
                http://tinyurl.com/6xkeen
                is prime, if we use O'Neill's tranliteration in line 1170 of
                http://tinyurl.com/nnaqlk

                David
              • Alan Eliasen
                ... Spoiler space follows. . .. . . . . . . . . . .. .. . . . . . . . . . . . . . . . . . . . . . Sum in base 41843 is
                Message 7 of 16 , Sep 3, 2009
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                  On 09/03/2009 02:40 AM, djbroadhurst wrote:
                  > Suppose that we parse the string "cab", in base p, as
                  > 12*p^2 + 10*p + 11. Then "cab" is a prime in the prime
                  > base p = 41, where it evaluates to the decimal number 20593.
                  >
                  > Similarly, we may parse the incantation "abracadabra",
                  > in base p, as 10*p^10 + 11*p^9 + 27*p^8 + 10*p^7 + 12*p^6 + 10*p^5
                  > + 13*p^4 + 10*p^3 + 11*p^2 + 27*p + 10, which evaluates to the prime
                  > 8510432846378191 in the prime base p = 31.
                  >
                  > The nonce-word "floccinaucinihilipilification" evaluates to the prime
                  > 352402927208050896786973658273234894386040810340804173543364510421
                  > in the prime base 199. For the meaning, see
                  > http://www.worldwidewords.org/weirdwords/ww-flo2.htm
                  >
                  > Puzzle: Find the smallest prime base in which Aristophanes' dish
                  > http://tinyurl.com/6xkeen
                  > is prime, if we use O'Neill's tranliteration in line 1170 of
                  > http://tinyurl.com/nnaqlk

                  Spoiler space follows.
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                  Sum in base 41843 is
                  9355934623362561735213219302693410823607868190849630269877\
                  6553684917032146922567250080317347155330911049352272600264891303788077990113278\
                  4853088920553317989172187911135472248955574815213603926445985233885389642117781\
                  4381160736048159727697869729116763488380008580384563935286216104489332003841643\
                  4760106323998198183345546437753307049885244185702893171182361757187414650365639\
                  1793563743445464735466507739792305201194704747538514165228148227347542716827410\
                  3317461237255320643879853668183786679561917227974652256331446555994563730135516\
                  3026904731364993396280828241651057013994638897984779596310112725585193309862898\
                  9978162623129572344332751322965737425155187359894442966740804307156470888035472\
                  2453994844494330604029034206329792396426299163600028180427618021437461076507541\
                  3062782241110381733982885164991797153719562713304314423


                  --
                  Alan Eliasen
                  eliasen@...
                  http://futureboy.us/
                • djbroadhurst
                  ... gave a solution in agreement with [spoiler!] http://primes.utm.edu/curios/page.php?number_id=9432 More ambitiously, one might consider the 1185-letter word
                  Message 8 of 16 , Sep 3, 2009
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                    --- In primenumbers@yahoogroups.com, Alan Eliasen <eliasen@...>
                    gave a solution in agreement with [spoiler!]
                    http://primes.utm.edu/curios/page.php?number_id=9432

                    More ambitiously, one might consider the 1185-letter word
                    for the Tobacco Mosaic Virus, Dahlemense Strain, at
                    http://www.fun-with-words.com/word_longest.html

                    By my reckoning, this is probably prime in
                    20 different prime bases less than 10^6.

                    David
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