%I A087478
%S A087478 3,1,4,1,5,9,2,6,5,1,8,3,2,9,0,0,5,6,2,8,7,8,6,7,4,4,8,2,8,8,3,4,3,3,
%T A087478 3,7,1,6,7,7,5,1,1,5,3,3,4,0,2,8,2,2,3,0,8,4,5,8,1,0,7,6,3,3,2,8,5,5,
%U A087478 1,0,7,3,1,3,8,4,0,9,6,5,9,5,4,9,4,3,7,6,1,4,8,7,4,9,9,1,2,1,9,7
%N A087478 Decimal expansion of (Sqrt[20467] - Sqrt[19578] + Sqrt[10177] - Sqrt[9553])/
               2.
%C A087478 This is the best approximation to Pi using four square roots (with coefficients 
               +/-1) of n < 200000, see also A087477.
%Y A087478 Cf. A000796, A087477.
%Y A087478 Sequence in context: A166050 A152040 A013705 this_sequence A112602 A000796 
               A114609
%Y A087478 Adjacent sequences: A087475 A087476 A087477 this_sequence A087479 A087480 
               A087481
%K A087478 easy,nonn,cons
%O A087478 1,1
%A A087478 Zak Seidov (zakseidov(AT)yahoo.com), Sep 09 2003