Search: id:A070200
Results 1-1 of 1 results found.

%I A070200
%S A070200 0,0,1,0,1,1,0,1,1,1,1,0,1,1,1,1,1,1,0,1,1,1,1,1,1,1,1,0,1,1,1,1,1,1,1,
%T A070200 1,1,1,2,0,1,1,1,1,1,1,2,1,1,1,1,1,2,2,0,1,1,1,1,1,1,2,2,2,1,1,1,2,1,2,
%U A070200 2,2,0,1,1,1,1,2,1,2,2,2,2,2,1,1,1,2,1,2
%N A070200 Inradii of integer triangles [A070080(n), A070081(n), A070082(n)], rounded 
               values.
%C A070200 Triangles [A070080(A070209(n)), A070081(A070209(n)), A070082(A070209(n))] 
               have integer inradii = a(A070209(k))= A070210(k).
%H A070200 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               Incircle.html">Incircle</a>.
%H A070200 R. Zumkeller, <a href="a070080.txt">Integer-sided triangles</a>
%F A070200 a(n) = SquareRoot((s-u)*(s-v)*(s-w)/s), where u=A070080(n), v=A070081(n), 
               w=A070082(n) and s=A070083(n)/2=(u+v+w)/2.
%e A070200 [A070080(25), A070081(25), A070082(25)]=[3,5,6] and s=A070083(25)/2=(3+5+6)/
               2=7: a(25)=SquareRoot((s-3)*(s-5)*(s-6)/7) = SquareRoot((7-3)*(7-5)*(7-6)/
               7) = SquareRoot(4*2*1/7) = SquareRoot(8/7) = 1.069, rounded = 1.
%Y A070200 Cf. A070086.
%Y A070200 Sequence in context: A134541 A154782 A144474 this_sequence A025914 A025916 
               A025905
%Y A070200 Adjacent sequences: A070197 A070198 A070199 this_sequence A070201 A070202 
               A070203
%K A070200 nonn
%O A070200 1,39
%A A070200 Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 05 2002

Search completed in 0.001 seconds