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COMMENTS
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The generators for the currently known triples are:
a(1): (5,138),(38,77),(55,78): Charles Shedd, 1945
a(5): (731,10434),(1122,9077),(2465,7238): Dan Hoey, May 18 1990
a(6): (352538,2999447),(1931103,2398838),(3063347,3215070): Duncan Moore, Mar 01 2017
The generator (a,b) gives the Pythagorean triangle (b^2+a^2,b^2-a^2,2ab) with area ab(b^2-a^2).
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EXAMPLE
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The generators of a(1) give the 3 Pythagorean triangles (19069,19019,1380), (7373,4485,5852) and (9109,3059,8580). They have the areas 19019*1380/2 = 4485*5852/2 = 3059*8580/2 = 13123110 = a(1).
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