A050272 Starting positions of strings of 2 9's in the decimal expansion of Pi.

44, 79, 459, 705, 747, 762, 763, 764, 765, 766, 777, 1063, 1073, 1385, 1395, 1428, 1477, 1532, 1730, 1981, 2000, 2071, 2114, 2218, 2241, 2285, 2335, 2436, 2644, 2796, 2910, 2949, 2950, 3089, 3217, 3294, 3508, 3564, 3570, 3673, 3678, 3710

Offset

1,1

Links

Table of n, a(n) for n=1..42.

Index entries for sequences related to the number Pi

Eric Weisstein's World of Mathematics, Pi Digits

Mathematica

q=8!; z=9; 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 *)
Transpose[SequencePosition[RealDigits[Pi, 10, 4000][[1]], {9, 9}]][[1]]-1 (* The program uses the SequencePosition function from Mathematica version 10 *) (* Harvey P. Dale, Dec 27 2015 *)

Crossrefs

Sequence in context: A039386 A043209 A043989 * A260201 A112721 A195816

Adjacent sequences: A050269 A050270 A050271 * A050273 A050274 A050275

Keyword

nonn,base

Author

Eric W. Weisstein

Status

approved