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March 12th, 2013, 10:57 AM  #1 
Member Joined: Jan 2013 Posts: 96 Thanks: 0  Integers
Prove that there are infinitely many integers numbers: such that !

March 12th, 2013, 12:50 PM  #2 
Member Joined: Mar 2013 Posts: 90 Thanks: 0  Re: Integers
Set .

March 12th, 2013, 01:45 PM  #3 
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 937 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms  Re: Integers
Prove the stronger statement: there are infinitely many positive integers m such that m^2 = a^2 + b^2 + c^2 for a, b, and c positive integers. (For more of a challenge, show that such m are of density 1 in the positive integers.) 
March 13th, 2013, 11:58 AM  #4 
Member Joined: Jan 2013 Posts: 96 Thanks: 0  Re: Integers
I forgot to write that a,b,c are different by 0 !

March 17th, 2013, 12:50 AM  #5 
Member Joined: Feb 2011 Posts: 68 Thanks: 0  Re: Integers
find zs such that a^2+b^2=z^2 and z^2+c^2=m^2. for example (3*3)^2+(4*3)^2=(5*3)^2 and (3*5)^2+(4*5)^2=(5*5)^2. 

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