This site is supported by donations to The OEIS Foundation.

 Annual Appeal: Please make a donation to keep the OEIS running. In 2018 we replaced the server with a faster one, added 20000 new sequences, and reached 7000 citations (often saying "discovered thanks to the OEIS"). Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A109514 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. 12

%I

%S 5,9696,19781,199898

%N 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.

%C The next term is greater than 10^7

%H David G. Andersen, <a href="http://www.angio.net/pi/piquery">The Pi-Search Page</a>.

%e 5 is a term because the 5th single digit in Pi is 5. Number 9696 is a term because the 9696th quadruplet in the decimal digits of Pi is 9696. (cf. 3.14159...)

%t 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

%Y Cf. A109513, A057679, A057680.

%K base,more,nonn

%O 0,1

%A _Colin Rose_, Jul 01 2005

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 14 14:37 EST 2018. Contains 318098 sequences. (Running on oeis4.)