A050254 Starting positions of strings of 2 7's in the decimal expansion of Pi.

559, 621, 625, 633, 739, 742, 890, 948, 954, 1066, 1087, 1179, 1261, 1307, 1545, 1589, 1590, 1591, 1630, 1704, 1953, 2049, 2173, 2212, 2325, 2337, 2471, 2672, 3057, 3074, 3111, 3278, 3282, 3806, 3941, 4143, 4208, 4345, 4441, 4575, 4576

Offset: 1

Author

Eric W. Weisstein

Keywords

• nonn
• base

Links

• Eric Weisstein's World of Mathematics, Pi Digits
• Index entries for sequences related to the number Pi

Programs

Mathematica

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 (* Vladimir Joseph Stephan Orlovsky, Jun 19 2009 *)