login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A023104 (2^n)-th digit of infinite string 12345678910111213141516... 0
1, 2, 4, 8, 1, 2, 3, 6, 1, 0, 3, 1, 0, 2, 7, 6, 5, 4, 0, 9, 1, 4, 7, 1, 5, 5, 7, 0, 2, 5, 1, 5, 5, 5, 0, 4, 8, 1, 9, 0, 2, 2, 1, 0, 5, 6, 8, 1, 9, 1, 8, 2, 3, 5, 4, 4, 4, 3, 8, 7, 0, 0, 6, 3, 1, 2, 1, 5, 5, 0, 1, 1, 5, 9, 9, 3, 0, 1, 6, 4, 9, 1, 2, 5, 1, 8, 4, 3, 1, 1, 7, 2, 5, 7, 9, 6, 6, 7, 4, 9, 7, 1, 7, 0, 0, 3, 5, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..107.

FORMULA

a(n) = A007376(2^n). - Robert Israel, Jun 27 2014

MATHEMATICA

almostNatural[n_, b_] := Block[{m = 0, d = n, i = 1, l, p}, While[m <= d, l = m; m = (b - 1) i*b^(i - 1) + l; i++]; i--; p = Mod[d - l, i]; q = Floor[(d - l)/i] + b^(i - 1); If[p != 0, IntegerDigits[q, b][[p]], Mod[q - 1, b]]]; Array[ almostNatural[2^#, 10] &, 105, 0] (* Robert G. Wilson v, Jun 27 2014 and modified Jul 15 2014 *)

CROSSREFS

Cf. A007376, A033307, A023103.

Sequence in context: A097625 A010743 A072032 * A133145 A317414 A008952

Adjacent sequences:  A023101 A023102 A023103 * A023105 A023106 A023107

KEYWORD

nonn,base

AUTHOR

David W. Wilson

STATUS

approved

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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 22 18:31 EDT 2019. Contains 328319 sequences. (Running on oeis4.)