## 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!

1. ### 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

2. ### 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