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 March 16th, 2015, 05:40 AM #1 Senior Member   Joined: Sep 2013 From: Earth Posts: 827 Thanks: 36 Pythagorean Triples I'm starting my journey of 'number theory' by reading A Friendly Introduction to Number Theory (4th Edition) (Featured Titles for Number Theory): Joseph H. Silverman: 9780321816191: Amazon.com: Books . I'm in the chapter 2 which is Pythagorean Triples. I don't understand. It says there are numbers x,y and z such that $$a=2x+1,$$ $$b=2y+1$$ and $$c=2z.$$My problem is how these equations come? Last edited by skipjack; April 2nd, 2015 at 12:46 AM.
 March 16th, 2015, 10:26 AM #2 Senior Member   Joined: May 2013 Posts: 118 Thanks: 10 It might simply mean that a and b are odd, while c is even. Last edited by skipjack; April 2nd, 2015 at 12:43 AM.
 April 1st, 2015, 09:45 PM #3 Member   Joined: Apr 2015 From: india Posts: 83 Thanks: 0 Math Focus: pi,prime numbers,random function 121 + 9 = 130 = 81 + 49, what about 130? Last edited by skipjack; April 2nd, 2015 at 12:40 AM.
 April 2nd, 2015, 12:42 AM #4 Global Moderator   Joined: Dec 2006 Posts: 20,916 Thanks: 2199 As 130 is not a perfect square, a Pythagorean triple (a, b, c) cannot have (a, b) = (11, 3) or (9, 7). The book states "Next, suppose that a and b are both odd, which means that c would have to be even." That's why the book uses integers x, y and z in the way posted above.

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