login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A109513 Let k be an m-digit integer. Then k is a Pithy number if the k-th m-tuple in the decimal digits of Pi (after the decimal point) is the string k. 12
1, 19, 94, 3542, 7295, 318320, 927130, 939240, 688370303, 7682437410, 7996237896, 89594051933 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
David G. Andersen, The Pi-Search Page.
EXAMPLE
1 is a term because the first digit in Pi (after the decimal point) is 1.
19 is a term because the 19th pair of digits (after the decimal point) in Pi is 19:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
3. 14 15 92 65 35 89 79 32 38 46 26 43 38 32 79 50 28 84 19 ...
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
Sequence in context: A118294 A157098 A037238 * A173368 A041696 A277977
KEYWORD
base,more,nonn
AUTHOR
Colin Rose, Jul 01 2005
EXTENSIONS
a(8)-a(11) from J. Volkmar Schmidt, Dec 17 2023
STATUS
approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 29 05:28 EDT 2024. Contains 371264 sequences. (Running on oeis4.)