[seqfan] Re: Number times reversal

mathstutoring mathstutoring at ntlworld.com
Sat Jan 7 14:01:30 CET 2012


Hi Franklin

I have put some Mathematica code for this on the sequence page and run it for n=1 to 100000.

The numbers that appear more than twice (and there could be many others) are in an attached pdf file - together with their frequency of occurrence - sent to you directly.

Hope that helps

Ant King (UK)

----- Original Message ----- 
From: <franktaw at netscape.net>
To: <seqfan at list.seqfan.eu>
Sent: Saturday, January 07, 2012 9:00 AM
Subject: [seqfan] Number times reversal


> https://oeis.org/A061205 is the sequence of integers multiplied by 
> their digit reversals; e.g. a(12) = 12*21 = 252.
> 
> The sequence includes the squares of palindromes times powers of 10, 
> each occurring once; and products of non-palindromes and their 
> reversals, each occurring twice.
> 
> What I'm wondering is whether there are any other duplications in the 
> sequence; equivalently, any number that occurs more than twice in the 
> sequence.
> 
> Franklin T. Adams-Watters
> 
> _______________________________________________
> 
> Seqfan Mailing list - http://list.seqfan.eu/


More information about the SeqFan mailing list