%-------------------------------------------------------------------------------
% UF Sparse Matrix Collection, Tim Davis
% http://www.cise.ufl.edu/research/sparse/matrices/JGD_Trefethen/Trefethen_700
% name: JGD_Trefethen/Trefethen_700
% [Diagonal matrices with primes, Nick Trefethen, Oxford Univ.]
% id: 2210
% date: 2008
% author: N. Trefethen
% ed: J.-G. Dumas
% fields: name title A id date author ed kind notes
% kind: combinatorial problem
%-------------------------------------------------------------------------------
% notes:
% Diagonal matrices with primes, Nick Trefethen, Oxford Univ.          
% From Jean-Guillaume Dumas' Sparse Integer Matrix Collection,         
% http://ljk.imag.fr/membres/Jean-Guillaume.Dumas/simc.html            
%                                                                      
% Problem 7 of the Hundred-dollar, Hundred-digit Challenge Problems,   
% SIAM News, vol 35, no. 1.                                            
%                                                                      
% 7. Let A be the 20,000 x 20,000 matrix whose entries are zero        
% everywhere except for the primes 2, 3, 5, 7, . . . , 224737 along the
% main diagonal and the number 1 in all the positions A(i,j) with      
% |i-j| = 1,2,4,8, . . . ,16384.  What is the (1,1) entry of inv(A)?   
%                                                                      
% http://www.siam.org/news/news.php?id=388                             
%                                                                      
% Filename in JGD collection: Trefethen/trefethen_700.sms              
%-------------------------------------------------------------------------------
