A173999 Successive positions of odd digits in decimal expansion of Pi (position 0 means 3 before comma or decimal point).

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

Offset: 0

Author

Artur Jasinski, Mar 05 2010

Keywords

• nonn
• base

Examples

			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.
		

Crossrefs

Cf. A000796, A174000.

Programs

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 *)

Extensions

Edited by Charles R Greathouse IV, Aug 02 2010

Definition clarified by Harvey P. Dale, Apr 01 2019