GT. The Largest Escher Exhibit Ever
The world’s largest ever exhibit of Escher’s works is on display, right now, at the Boca Raton Musuem of Art If you can, this is a must see event! We talk with the collector, Rock J. Walker about his fascination with this amazing work.
And of course we answer last week’s puzzle, and hear from listeners!
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Ken Davis said,
February 28, 2010 at 7:42 am
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
Dan M said,
March 5, 2010 at 10:52 am
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