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a(n) = denominator of squared radius R^2 of the circumcircle of the n-th triangle with integer sides i <= j <= k in a list of such triangles, the list being sorted by increasing size of R. Numerators are A331227.
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%I #6 Jan 13 2020 15:19:35

%S 3,15,3,7,35,32,1,20,63,15,15,55,3,4,99,96,39,91,231,11,84,3,224,143,

%T 7,7,35,5,64,8,39,119,455,1,51,255,195,320,192,96,96,187,180,95,171,

%U 55,160,3135,399,255,5,63,3,3,3,3,247,15,15,15,15,36,231,132,55

%N a(n) = denominator of squared radius R^2 of the circumcircle of the n-th triangle with integer sides i <= j <= k in a list of such triangles, the list being sorted by increasing size of R. Numerators are A331227.

%C See A331222 and A331227.

%e See A331227.

%Y Cf. A331222, A331223, A331227.

%K nonn,frac

%O 1,1

%A _Hugo Pfoertner_, Jan 12 2020