A050222 Starting positions of strings of 2 3's in the decimal expansion of Pi.

24, 215, 230, 282, 364, 401, 503, 507, 831, 875, 1032, 1127, 1302, 1353, 1667, 1686, 1698, 1699, 1986, 2568, 2841, 3175, 3289, 3488, 3583, 3620, 3702, 3719, 3833, 3918, 4101, 4265, 4325, 4594, 4623, 4689, 4814, 4928, 4929, 5211, 5269, 5398

Offset: 1

Author

Eric W. Weisstein

Keywords

• nonn
• base

Comments

Starting positions are counted from and after the decimal point. Harvey P. Dale, Mar 09 2022

Links

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

Crossrefs

Cf. A000796.

Programs

Mathematica

q=3;a=RealDigits[Pi,10,2*7! ];lst={};Do[b=a[[1]][[n]];c=a[[1]][[n+1]];If[b==q&&c==q,AppendTo[lst,n-1]],{n,2*7!-1}];lst (* Vladimir Joseph Stephan Orlovsky, Jun 07 2009 *)
SequencePosition[RealDigits[Pi,10,6000][[1]],{3,3}][[All,1]]-1 (* Harvey P. Dale, Mar 09 2022 *)