A050230 Starting positions of strings of 2 4's in the decimal expansion of Pi.

59, 125, 182, 201, 217, 453, 511, 655, 726, 804, 833, 1249, 1252, 1508, 1639, 1904, 2085, 2261, 2309, 2350, 2707, 2708, 2764, 2799, 2827, 2845, 2928, 2929, 3109, 3139, 3372, 3476, 3477, 3681, 3717, 3787, 3809, 3810, 3851, 3866, 3867, 3905

Offset

1,1

Links

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

Eric Weisstein's World of Mathematics, Pi Digits

Index entries for sequences related to the number Pi

Mathematica

q=8!; z=4; 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 *)
Flatten[Position[Partition[Rest[RealDigits[Pi, 10, 5000][[1]]], 2, 1], _? (#=={4, 4}&)]] (* Harvey P. Dale, Jul 20 2011 *)

Crossrefs

Cf. A000796.

Sequence in context: A141934 A044246 A044627 * A138633 A237687 A098032

Adjacent sequences: A050227 A050228 A050229 * A050231 A050232 A050233

Keyword

nonn,base

Author

Eric W. Weisstein

Status

approved