Misprint
in [Mathematica]
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From: Alexey on 18 Jul 2010 01:05 Hello, It seems that there is a misprint on the page http://www.wolfram.com/products/mathematica/usersanduses/mersenne.html We read that "In June 1999 an international group of mathematicians, computer scientists, and hobbyists <...> discovered that 2^6972593-1 is prime." But it is not true: In[3]:= PrimeQ[2^26972593 - 1] Out[3]= False
From: Ken Levasseur on 19 Jul 2010 02:08 Alexey You added a 2 to the base of the expression Ken Sent from my iPad On Jul 18, 2010, at 1:05 AM, Alexey <lehin.p(a)gmail.com> wrote: > Hello, > > It seems that there is a misprint on the page > http://www.wolfram.com/products/mathematica/usersanduses/mersenne.html > We read that "In June 1999 an international group of mathematicians, > computer scientists, and hobbyists <...> discovered that 2^6972593-1 > is > prime." But it is not true: > In[3]:= PrimeQ[2^26972593 - 1] > Out[3]= False >
From: Bill Rowe on 19 Jul 2010 02:10 On 7/18/10 at 1:05 AM, lehin.p(a)gmail.com (Alexey) wrote: >It seems that there is a misprint on the page >http://www.wolfram.com/products/mathematica/usersanduses/mersenne. >html We read that "In June 1999 an international group of >mathematicians, computer scientists, and hobbyists <...> discovered >that 2^6972593-1 is prime." But it is not true: In[3]:= >PrimeQ[2^26972593 - 1] Out[3]= False Given <http://en.wikipedia.org/wiki/Mersenne_prime#cite_note-17> and <http://primes.utm.edu/mersenne/> both indicate 2^6972593-1 is prime and cite references, it does seem like the issue is not a typo on the web page you found. Rather, it seems there is a problem with PrimeQ. Note, I didn't wait long enough for PrimeQ to return a response on my system and consequently did not reproduce your result.
From: Alexey Popkov on 20 Jul 2010 03:44 I apologize. It is my typo: I wrote 2^26972593 instead of 2^6972593. "Ken Levasseur" <klevasseur(a)mac.com> news:i20q4h$kdt$1(a)smc.vnet.net... > Alexey > > You added a 2 to the base of the expression > > Ken > > Sent from my iPad > > On Jul 18, 2010, at 1:05 AM, Alexey <lehin.p(a)gmail.com> wrote: > >> Hello, >> >> It seems that there is a misprint on the page >> http://www.wolfram.com/products/mathematica/usersanduses/mersenne.html >> We read that "In June 1999 an international group of mathematicians, >> computer scientists, and hobbyists <...> discovered that 2^6972593-1 >> is >> prime." But it is not true: >> In[3]:= PrimeQ[2^26972593 - 1] >> Out[3]= False >> > >
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