A053748 Positions of 4's in the decimal expansion of Pi.

3, 20, 24, 37, 58, 60, 61, 71, 88, 93, 105, 120, 126, 127, 146, 152, 158, 163, 183, 184, 189, 193, 202, 203, 218, 219, 224, 228, 252, 255, 263, 267, 272, 274, 279, 294, 297, 304, 322, 340, 349, 372, 377, 385, 387

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Index entries for sequences related to the number Pi

Formula

a(n) = A037003(n) + 1. - Georg Fischer, May 31 2021

Example

Pi starts off 3.141592653589793238462643383279502884197..., with 4s in the hundredths' (10^(-2)s') place, which is the third digit counting the 3 in the ones' place. Then there's another 4 at the 10^(-19)s' place, which is the twentieth digit counting the initial 3. [Alonso del Arte, Oct 07 2013]

Mathematica

Flatten[Position[RealDigits[Pi, 10, 1000][[1]], 4]] (* Vincenzo Librandi, Oct 07 2013 *)

Crossrefs

Cf. A000796, A037003.

Sequence in context: A222482 A022129 A308721 * A075358 A352810 A002461

Adjacent sequences: A053745 A053746 A053747 * A053749 A053750 A053751

Keyword

nonn,base

Author

Simon Plouffe, Feb 20 2000

Status

approved