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

 

Logo

Annual Appeal: Today, Nov 11 2014, is the 4th anniversary of the launch of the new OEIS web site. 70,000 sequences have been added in these four years, all edited by volunteers. Please make a donation (tax deductible in the US) to help keep the OEIS running.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A073531 Number of n-digit positive integers with all distinct digits. 4
9, 81, 648, 4536, 27216, 136080, 544320, 1632960, 3265920, 3265920, 0, 0, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

For any base b the number of distinct-digit numbers is finite. For base 10, the maximal distinct-digit number is 9876543210; for any larger number at least two digits coincide. The number of distinct-digit primes is also finite, see A073532.

LINKS

Table of n, a(n) for n=1..13.

Eric Weisstein's World of Mathematics, Digit

FORMULA

a(n) = 9*9!/(10-n)!.

EXAMPLE

a(3)=648 because there are 648 three-digit integers with distinct digits.

MATHEMATICA

Table[9*9!/(10-n)!, {n, 10}]

CROSSREFS

Cf. A073532.

Sequence in context: A213297 A206728 A206857 * A206694 A125910 A171283

Adjacent sequences:  A073528 A073529 A073530 * A073532 A073533 A073534

KEYWORD

base,nonn

AUTHOR

Zak Seidov, Aug 29 2002

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified December 19 19:47 EST 2014. Contains 252239 sequences.