The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
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!)
A102827 "True already", base 10, start 1: a(n) is the least integer such that the sequence up to a(n-1) written in base 10 contains floor(a(n)/10) copies of the digit a(n) % 10, with a(0) = 1. 1

%I #6 Mar 30 2014 12:56:37

%S 1,2,3,4,5,6,7,8,9,11,12,13,14,15,16,17,18,19,22,23,24,25,26,27,28,29,

%T 33,34,35,36,37,38,39,44,45,46,47,48,49,55,56,57,58,59,66,67,68,69,77,

%U 78,79,88,89,99,111,112,113,114,115,116,117,118,119,122,123,124,125,126,127,128,129,133

%N "True already", base 10, start 1: a(n) is the least integer such that the sequence up to a(n-1) written in base 10 contains floor(a(n)/10) copies of the digit a(n) % 10, with a(0) = 1.

%C Conjecture: this sequence in various bases never includes a term divisible by the base.

%D Inspired by discussion of "True so far" from _Eric Angelini_ (A102357).

%e The first 9 values of the sequence written in decimal include no '0's and 1 '1', so the next value cannot be 10 (the count of '0's is not 1) but can be 11.

%p A102827aux := proc(n,dig)

%p local c,d ;

%p c := 0 ;

%p for d in convert(n,base,10) do

%p if d = dig then

%p c := c+1 ;

%p end if;

%p end do:

%p c ;

%p end proc:

%p A102827 := proc(n)

%p option remember;

%p local a,a10,ad,cum;

%p if n < 8 then

%p return n+1 ;

%p end if;

%p for a from 1 do

%p a10 := floor(a/10) ;

%p ad := a mod 10 ;

%p cum := add( A102827aux(procname(i),ad),i=0..n-1) ;

%p if cum = a10 then

%p return a;

%p end if;

%p end do:

%p end proc: # _R. J. Mathar_, Mar 30 2014

%Y Cf. A102823-A102830, A102357.

%K nonn,easy,base

%O 0,2

%A _Hugo van der Sanden_, Feb 26 2005

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 May 17 08:10 EDT 2024. Contains 372579 sequences. (Running on oeis4.)