The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A171059 a(n) is the lexically first sequence of distinct nonzero integers such that if S(n) is the string formed from the digits of a(1)a(2)...a(n), then dividing S(n) into substrings with lengths equal to the successive digits of S(n) (treating 0 as 10) results in substrings beginning with the successive digits of Pi (A000796). 1

%I

%S 3,1,2,14,4,15,5,6,7,9,8,10,26,11,12,50,13,23,16,17,25,18,19,20,80,21,

%T 22,24,29,27,28,30,37,90,31,32,33,34,35,200,36,43,84,60,201,38,61,39,

%U 40,41,42,430,53,48,44,320,45,46,79,47,49,51,52

%N a(n) is the lexically first sequence of distinct nonzero integers such that if S(n) is the string formed from the digits of a(1)a(2)...a(n), then dividing S(n) into substrings with lengths equal to the successive digits of S(n) (treating 0 as 10) results in substrings beginning with the successive digits of Pi (A000796).

%C Erase the punctuation:

%C S(Pi) = 312144155679810261112501323161725181920802122242927283037903132333435...

%C Divide into chunks -- the size of each chunk is given by the successive DIGITS of S(Pi):

%C 312.1.44.1.5567.9810.2.61112.50132.316172.5181920.802122242.92728303.7.9031323334.35

%C (the "0" digits produce a 10-digit chunk)

%C Replace all dots (.) with carriage returns:

%C 312

%C 1

%C 44

%C 1

%C 5567

%C 9810

%C 2

%C 61112

%C 50132

%C 316172

%C 5181920

%C 802122242

%C 92728303

%C 7

%C 9031323334

%C 35

%C ...

%C The first column shows Pi!

%C a(63) = 52 is the last term, a(64) would have to begin with a 0. - _Charlie Neder_, Jun 24 2018

%H Eric Angelini, <a href="http://www.cetteadressecomportecinquantesignes.com/PiFou.htm">Un nombre de ouf!</a>

%H E. Angelini, <a href="/A171059/a171059.pdf">Un nombre de ouf!</a> [Cached copy, with permission]

%K nonn,base,fini,full

%O 1,1

%A _N. J. A. Sloane_, Sep 04 2010, based on a posting to the Sequence Fans Mailing List by _Eric Angelini_, Aug 24 2010

%E a(40)-a(63) from _Charlie Neder_, Jun 24 2018

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 September 24 07:28 EDT 2020. Contains 337317 sequences. (Running on oeis4.)