http://mathfactor.uark.edu/2010/02/gt-the-largest-escher-exhibit-ever/ The Math Factor Podcast Site Fri, 08 Aug 2014 12:52:06 +0000 hourly 1 https://wordpress.org/?v=4.9.25 http://mathfactor.uark.edu/2010/02/gt-the-largest-escher-exhibit-ever/comment-page-1/#comment-739 Fri, 05 Mar 2010 15:52:54 +0000 http://mathfactor.uark.edu/?p=1020#comment-739 You may also want to check out the online Escher exhibit at the National Gallery of Canada’s site:
http://cybermuse.gallery.ca/cybermuse/youth/escher/index_e.jsp
 

]]> http://mathfactor.uark.edu/2010/02/gt-the-largest-escher-exhibit-ever/comment-page-1/#comment-735 Sun, 28 Feb 2010 12:42:45 +0000 http://mathfactor.uark.edu/?p=1020#comment-735 Sexy primes are pairs of primes of the form (p, p+6), so-named since “sex” is the Latin word for “six.”  A sexy prime triplet is thus thre primes of the form (p, p+6,p+12)
The primes in the triplet I found have 5132 digits with
p=(84055657369* 205881*4001# * (205881 * 4001# + 1) + 210)*(205881 *4001# – 1)/35 + 1
The complex structure is to ensure that each member of the triplet can be proven prime using the BLS (Brillhart, Lehmer and Selfridge) test. A BLS test on a number of this size takes only about 1 minute.
Wheras proving a random number of this length prime  would have required months of processing on the PCs available to me.
Cheers
Ken

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