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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A178788 Characteristic function of numbers having distinct digits in their decimal representation. 19
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

a(A010784(n)) = 1; a(A109303(n)) = 0;

first differences of A178787.

a(n) <= A196368(n).

a(n) = 0 for n > 9*9!. - Hieronymus Fischer, Feb 02 2013

LINKS

R. Zumkeller, Table of n, a(n) for n = 0..10000

Eric Weisstein's World of Mathematics, Digit

Index entries for characteristic functions

FORMULA

a(n) = 0^(A055642(n)-A043537(n)).

MATHEMATICA

lst = {}; Do[If[Select[Tally[IntegerDigits[n]][[All, 2]], # > 1 &] == {}, AppendTo[lst, 1], AppendTo[lst, 0]], {n, 0, 104}]; lst (* Arkadiusz Wesolowski, May 10 2012 *)

PROG

(Haskell)

import Data.List (nub)

a178788 n = fromEnum $ nub (show n) == show n

-- Reinhard Zumkeller, Sep 25 2011

CROSSREFS

Sequence in context: A294935 A242902 A196368 * A131217 A105567 A114213

Adjacent sequences:  A178785 A178786 A178787 * A178789 A178790 A178791

KEYWORD

base,nonn

AUTHOR

Reinhard Zumkeller, Jun 30 2010

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 April 7 01:11 EDT 2020. Contains 333291 sequences. (Running on oeis4.)