A109514 - OEIS

A109514

Let k be an integer consisting of m digits. Then k is a Pithy number if the k-th m-tuple in the decimal digits of Pi is k.

5, 9696, 19781, 199898, 687784863, 4518673035, 7526556436

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OFFSET

1,1

COMMENTS

A near-miss '02805451' occurs at position 2805451. - Vaclav Kotesovec, Feb 19 2020

LINKS

Table of n, a(n) for n=1..7.

David G. Andersen, The Pi-Search Page.

EXAMPLE

5 is a term because the 5th single digit in Pi is 5.

9696 is a term because the 9696th quadruplet in Pi is 9696.

MATHEMATICA

PithyNumbersWith3[m_] := Module[{cc = m(10^m)+m, sol, aa}, sol = Partition[RealDigits[Pi, 10, cc] // First, m]; Do[aa = FromDigits[sol[[i]]]; If[aa==i, Print[{i, aa}]], {i, Length[sol]}]; ]

(* Example: PithyNumbersWith3[5] produces all 5-digit Pithy numbers *)

CROSSREFS

Cf. A109513, A057679, A057680.

Sequence in context: A067816 A076629 A052027 * A022918 A212617 A160741

Adjacent sequences: A109511 A109512 A109513 * A109515 A109516 A109517

KEYWORD

base,more,nonn

AUTHOR

Colin Rose, Jul 01 2005

EXTENSIONS

a(5)-a(7) from J. Volkmar Schmidt, Dec 17 2023

STATUS

approved