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A231100
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Even legs of primitive Pythagorean triples (with multiplicity) sorted with respect to increasing hypotenuse.
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5
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4, 12, 8, 24, 20, 12, 40, 28, 60, 16, 56, 48, 36, 84, 80, 72, 20, 60, 112, 44, 88, 24, 144, 140, 132, 120, 52, 180, 104, 176, 168, 28, 84, 156, 140, 220, 60, 208, 120, 32, 96, 264, 260, 252, 160, 240, 68, 136, 224, 312, 308, 36, 204, 288, 180, 272, 76, 364, 252, 152, 352, 340, 228
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OFFSET
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1,1
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COMMENTS
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The primary key is the increasing length of the hypotenuse, A020882. If there is more than one solution with that hypotenuse, the (secondary) sorting key is the (increasing) even leg - that is, the terms go in the increasing order. [Corrected by Andrey Zabolotskiy, Oct 31 2019]
Only the even legs 'b' of reduced triangles with gcd(a,b,c)=1, a^2+b^2=c^2, a=q^2-p^2, b=2*p*q, c=q^2+p^2, gcd(p,q)=1 are listed.
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LINKS
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FORMULA
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EXAMPLE
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a(13) = sqrt(A020882(13)^2-A180620(13)^2) = sqrt(85^2-77^2) = sqrt(1296) = 36.
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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