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A020887 Ordered set of a + b - c as (a,b,c) runs through all primitive Pythagorean triples with a<b<c. 7

%I #15 Jan 23 2020 12:49:24

%S 2,4,6,6,8,10,10,12,12,14,14,16,18,18,20,20,22,22,24,24,26,26,28,28,

%T 30,30,30,30,32,34,34,36,36,38,38,40,40,42,42,42,42,44,44,46,46,48,48,

%U 50,50,52,52,54,54,56,56,58,58,60,60,60,60,62,62,64,66,66,66,66,68,68,70

%N Ordered set of a + b - c as (a,b,c) runs through all primitive Pythagorean triples with a<b<c.

%C Also called "excess" of primitive Pythagorean triangles and corresponds to incircle's diameter. - _Lekraj Beedassy_, Dec 01 2003

%H Ray Chandler, <a href="/A020887/b020887.txt">Table of n, a(n) for n = 1..10000</a>

%H D. McCullough, <a href="http://www.math.ou.edu/~dmccullough/teaching/pythagoras2.pdf">The Height and Excess of Pythagorean Triples</a>

%F a(n) = 2*A020888(n).

%Y For values ordered by hypotenuse, see A087459.

%K nonn

%O 1,1

%A _Clark Kimberling_

%E Offset corrected to 1 by _Ray Chandler_, Jan 23 2020

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