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A109513 Let n be an integer consisting of m digits. Then n is a Pithy number if the n-th m-tuple in the decimal digits of Pi is string n (after the decimal point in Pi). 12
1, 19, 94, 3542, 7295, 318320, 927130, 939240 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

The next Pithy number is greater than 10^7

LINKS

Table of n, a(n) for n=0..7.

David G. Andersen, The Pi-Search Page.

EXAMPLE

1 is a term because the first digit in Pi (after the decimal point) is 1. Number 19 is a term because the 19th pair (after the decimal point) in Pi is 19. (cf. 3.14159265358979323846264338327950288419...)

MATHEMATICA

PithyNumbers[m_] := Module[{cc = m(10^m)+m, sol, aa}, sol = Partition[RealDigits[Pi, 10, cc] // First // Rest, m]; Do[aa = FromDigits[sol[[i]]]; If[aa==i, Print[{i, aa}]], {i, Length[sol]}]; ] Example: PithyNumbers[4] produces all 4-digit Pithy numbers

CROSSREFS

Cf. A109514, A057679, A057680.

Sequence in context: A118294 A157098 A037238 * A173368 A041696 A277977

Adjacent sequences:  A109510 A109511 A109512 * A109514 A109515 A109516

KEYWORD

base,more,nonn

AUTHOR

Colin Rose, Jul 01 2005

STATUS

approved

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Last modified June 22 12:24 EDT 2017. Contains 288613 sequences.