%I #10 Oct 01 2016 16:55:52
%S 1,1,2,3,7,2,4,2,2,0,1,1,3,3,0,0,4,2,0,1,0,2,0,2,0,2,3,0,1,0,1,2,2,0,
%T 4,0,3,0,0,1,2,3,0,1,4,4,0,0,0,3,0,4,4,0,1,2,0,5,5,1,4,5,4,2,6,1,2,1,
%U 0,0,1,4,5,2,0,0,2,4,1,3,0,2,0,1,1,3,2,0,1,1,4,1,0,0,2,2,2,0,1,1,3,3,2
%N Troughs in digital expansions of Pi: digits which are smaller than their neighbors.
%H Harvey P. Dale, <a href="/A105273/b105273.txt">Table of n, a(n) for n = 1..10000</a>
%F d[i]<d[i+1]&&d[i]<d[i-1]
%t Transpose[Select[Partition[RealDigits[Pi,10,500][[1]],3,1],Sign[ Differences[ #]]=={-1,1}&]][[2]] (* _Harvey P. Dale_, Dec 24 2014 *)
%K nonn,base
%O 1,3
%A _Zak Seidov_, Apr 25 2005