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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A171869 a(n) is the period of A175555(n) in the sequence {A175555}. 0
 1, 2, 2, 2, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536, 131072, 262144, 524288, 1048576, 2097152, 4194304, 8388608, 16777216, 33554432, 67108864, 134217728, 268435456, 536870912, 1073741824, 2147483648, 4294967296 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Table of n, a(n) for n=1..36. FORMULA a(n) = 2^(n-4) if n > = 5. EXAMPLE {A175555} = {5, 25, 375, 625, 59375, ...} => a(1) = 1 because A175555(1) = 5 occurs with the period 1 in the sequence A175555; a(2) = 2 because A175555(2) = 25 occurs with the period 2 in the sequence A175555; a(3) = 2 because A175555(3) = 375 occurs with the period 2 in the sequence A175555. MAPLE nn:=2000:Digits:=nn:T:=array(1..nn):for n from 1 to nn do: T[n]:= irem(floor((1.5 ^n)*10^n), 10^n): od: for a from 1 to nn do: z1:=T[a]: ii:=0:k:=0:for b from a+1 to nn while(ii)=0 do:k:=k+1: z2:=irem(T[b], 10^a): if z1=z2 then ii:=1:printf(`%d, `, k): else fi:od:od: CROSSREFS Cf. A002379, A170828, A175555, A170827. Sequence in context: A132189 A162799 A034585 * A147751 A360315 A045948 Adjacent sequences: A171866 A171867 A171868 * A171870 A171871 A171872 KEYWORD nonn,base AUTHOR Michel Lagneau, Dec 30 2009, Apr 22 2010 EXTENSIONS More terms and edits. - Michel Lagneau, Jul 14 2012 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.

Last modified June 23 22:09 EDT 2024. Contains 373661 sequences. (Running on oeis4.)