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I just realised ...

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  • 08-10-2003 9:27pm
    #1
    ecksor
    Moderators, Social & Fun Moderators Posts: 10,501 Mod ✭✭✭✭


    ... my boards.ie userid is prime!

    and my birthday is the same as Paul Erdos


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    #2
    dod
    Closed Accounts Posts: 801 ✭✭✭dod


    busy there ecksor?:confused:


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    #3
    ecksor
    Moderators, Social & Fun Moderators Posts: 10,501 Mod ✭✭✭✭ecksor


    Trying to integrate.


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    #4
    Syth
    Registered Users Posts: 1,865 ✭✭✭Syth


    How do you find out your userid?


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    #5
    jd
    Registered Users Posts: 5,700 ✭✭✭jd


    easy way-click on the profile button under one of your posts..
    eg for you url will be
    http://www.boards.ie/vbulletin/member.php?s=&action=getinfo&userid=17826

    so userid=17826


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    #6
    dod
    Closed Accounts Posts: 801 ✭✭✭dod


    Damn the number 3 which causes my userid not to be prime.


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    #7
    charlieroot
    Registered Users Posts: 196 ✭✭charlieroot


    It is but it's not a cool prime, ie it isn't a sum of two squares because its not 1 mod4 :)


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    #8
    ecksor
    Moderators, Social & Fun Moderators Posts: 10,501 Mod ✭✭✭✭ecksor


    It is a Gaussian prime and that's good enough for me.


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    #9
    Capt'n Midnight
    Moderators, Recreation & Hobbies Moderators, Science, Health & Environment Moderators, Technology & Internet Moderators Posts: 91,754 Mod ✭✭✭✭Capt'n Midnight


    3 x 3 x 5 x 383 . Well at least it's the sum of two primes...

    383 is the sum of the first 3, three-digit palindromic primes: 101, 131 and 151.
    The smallest prime which can be represented as sum of a prime and its reverse (241 + 142 = 383).

    cf. http://primes.utm.edu/curios/

    PS - Prime check on http://primes.utm.edu/curios/includes/file.php?file=primetest.html


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    #10
    tribble
    Closed Accounts Posts: 1,478 ✭✭✭tribble


    I'm prime too :)

    userid 2689

    At least thets what Coolmaths tells me.

    Pity it doesn't tell me what a prime number is though...


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    #11
    ecksor
    Moderators, Social & Fun Moderators Posts: 10,501 Mod ✭✭✭✭ecksor


    In short, any natural number that has only two factors in the natural numbers, itself and 1.

    http://primes.utm.edu/glossary/page.php?sort=Prime
    http://mathworld.wolfram.com/PrimeNumber.html


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    #12
    charlieroot
    Registered Users Posts: 196 ✭✭charlieroot


    Being *really* pedantic about it, the proper definition for a prime is an element of a ring A such that if p|a*b, then p|a and/or p|b. The natural numbers don't form a ring and if you were to give the definition with respect to Z, the integers, as you have just done then you are really giving the definition of an irreducible element and not necessarily a prime, however when considering the ring Z, all irreducibles are prime - this is not always the case. Take for example the ring of integers in the field Q(sqrt[-5]).

    6 = (1-sqrt[-5])(1+sqrt[-5])

    3 | 6 but 3 does not divide 1-sqrt[-5]. Hence 3 is irreducible but not prime.


    Noel.


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    #13
    tribble
    Closed Accounts Posts: 1,478 ✭✭✭tribble


    I like ecksor's answer ;)

    charlieroot - you're talking to someone who passes uni. c.s./chem maths by hiring an Iraqi immigrant (sp?) for 6 hours in two 3 hour blocks to hypersaturate my brain with turnkey solutions for all possible questions on the maths paper. I don't goto maths lectures anymore - they depress me.
    While I'm proud of being able to do a year of maths in 6 hours I'm ashamed to say I don't understand one dot :(

    Oh well - could be worse - I mean, I hear some people actually enjoy maths - freaks ;)

    tribble


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    #14
    sceptre
    Registered Users Posts: 19,608 ✭✭✭✭sceptre


    Hmmm, /me is not prime.

    My userID is prime if you divide it by 74 first though and that's close enough for government work:)


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    #15
    Tree
    Moderators, Science, Health & Environment Moderators Posts: 4,710 Mod ✭✭✭✭Tree


    i is also prime
    [notes the number of maths heads w/ primes.....]


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    #16
    Capt'n Midnight
    Moderators, Recreation & Hobbies Moderators, Science, Health & Environment Moderators, Technology & Internet Moderators Posts: 91,754 Mod ✭✭✭✭Capt'n Midnight


    Originally posted by Tree
    i is also prime
    [notes the number of maths heads w/ primes.....]

    No I don't think the square root of minus one is a prime :D


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