

A173999


Successive positions of odd digits in decimal expansion of Pi (position 0 means 3 before comma or decimal point)


2



0, 1, 3, 4, 5, 8, 9, 10, 12, 13, 14, 15, 17, 24, 25, 27, 29, 30, 31, 37, 38, 39, 40, 42, 43, 44, 45, 46, 47, 48, 49, 51, 55, 56, 58, 61, 62, 64, 66, 68, 79, 80, 86, 90, 91, 94, 95, 96, 99, 100, 103, 109, 110, 111, 115, 120, 122, 123, 129, 130, 131, 133, 137, 138, 139, 141
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OFFSET

0,3


LINKS

Table of n, a(n) for n=0..65.


EXAMPLE

Pi=3,141592653589793...
0 in this sequence because 3 is odd.
1 in this sequence because 1 is odd.
2 is not in this sequence because second digit after comma 4 is not even.


MATHEMATICA

s = First[RealDigits[N[Pi, 1000]]]; aa = {}; Do[If[OddQ[s[[n]]], AppendTo[aa, n  1]], {n, 1, Length[s]}]; aa (*Artur Jasinski*)
Flatten[Position[RealDigits[\[Pi], 10, 150][[1]], _?OddQ]1] (* Harvey P. Dale, Apr 19 2011 *)


CROSSREFS

Cf. A000796, A174000.
Sequence in context: A120519 A100614 A274231 * A127427 A286994 A047205
Adjacent sequences: A173996 A173997 A173998 * A174000 A174001 A174002


KEYWORD

nonn,base


AUTHOR

Artur Jasinski, Mar 05 2010


EXTENSIONS

Edited by Charles R Greathouse IV, Aug 02 2010
Definition clarified by Harvey P. Dale, Apr 01 2019


STATUS

approved



