I think this is called "n - reversal of digits of n' where a(n) is a multiple of 9.
A good place to find out about number sequences is: http://www.research.att.com/~njas/sequences/ Which is where I found this sequence. Cheers, Kevin On Wed, Sep 04, 2002 at 09:30:59AM -0700, nyec ([EMAIL PROTECTED]) said something similar to: > This is off-topic, but I wasn't able to get an answer on a few math forums, > so I thought I'd pass it by the diverse Perl community. By accident my Perl > program produced some output - incorrect, but interesting. I was wondering if > anyone recognizes the numerical pattern or what it is called? I couldn't find > info on this during any of my searches. > > The program took a number sequence. For example <10-100>, reversed the digits > and calculated the difference of the original number. So the calculations > look like this: <10-01=9; 11-11=0; 12-21=9; 13-31=18; etc.>. > > Two things were noticeable, One, a pattern repeated (see output example > below). Two, the separation between differences was always <9>. Patterns were > present, albeit different, from <100-999>, and <1000-9999>. > > Can someone tell me what this is called? > > ## Example Output ## > 10 - 01 = 9 > 11 - 11 = 0 > 12 - 21 = 9 > 13 - 31 = 18 > 14 - 41 = 27 > 15 - 51 = 36 > 16 - 61 = 45 > 17 - 71 = 54 > 18 - 81 = 63 > 19 - 91 = 72 > 20 - 02 = 18 > 21 - 12 = 9 > 22 - 22 = 0 > 23 - 32 = 9 > 24 - 42 = 18 > 25 - 52 = 27 > 26 - 62 = 36 > 27 - 72 = 45 > 28 - 82 = 54 > 29 - 92 = 63 > 30 - 03 = 27 > 31 - 13 = 18 > ## END Example Output ## > > Thanks in advance for any information. This is driving me crazy. > > nyec > > -- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] -- [Writing CGI Applications with Perl - http://perlcgi-book.com] Disciple - Master, why isn't everything perfect? Zen Master - It is. -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
