[seqfan] Counting Problem

Harvey P. Dale hpd1 at nyu.edu
Thu Jun 18 00:00:56 CEST 2009



            Is the answer always 1?  The numbers satisfying your
conditions, starting with n=1, are 5, 75, 375, 9375, 59375, 359375, and
3359375.  Note that once any such number is found, the number for the
next higher n has the same ending digits with a prepended different odd






-----Original Message-----

From: seqfan-bounces at list.seqfan.eu
[mailto:seqfan-bounces at list.seqfan.eu] On Behalf Of David Wilson

Sent: Tuesday, June 16, 2009 11:22 PM

To: Sequence Fans

Subject: [seqfan] Counting problem


How many n-digit numbers with all odd digits are divisible by 5^n?


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