%I A050254
%S A050254 559,621,625,633,739,742,890,948,954,1066,1087,1179,1261,1307,1545,
%T A050254 1589,1590,1591,1630,1704,1953,2049,2173,2212,2325,2337,2471,2672,3057,
%U A050254 3074,3111,3278,3282,3806,3941,4143,4208,4345,4441,4575,4576
%N A050254 Starting positions of strings of 2 7's in the decimal expansion of Pi.
%H A050254 <a href="Sindx_Ph.html#Pi314">Index entries for sequences related to 
               the number Pi</a>
%H A050254 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               PiDigits.html">Link to a section of The World of Mathematics.</a>
%t A050254 q=8!;z=7;a=RealDigits[Pi,10,q];lst={};Do[b=a[[1]][[n]];c=a[[1]][[n+1]];
               If[b==z&&c==z,AppendTo[lst,n-1]],{n,q-1}];lst [From Vladimir Orlovsky 
               (4vladimir(AT)gmail.com), Jun 19 2009]
%Y A050254 Sequence in context: A104809 A105979 A071393 this_sequence A139197 A136346 
               A100987
%Y A050254 Adjacent sequences: A050251 A050252 A050253 this_sequence A050255 A050256 
               A050257
%K A050254 nonn
%O A050254 1,1
%A A050254 Eric Weisstein (eric(AT)weisstein.com)