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 January 30th, 2011, 09:21 PM #1 Senior Member   Joined: Jan 2009 Posts: 345 Thanks: 3 What topic in math deals with reverse numbers? What topic in math deals with the reversal of numbers. Say you have 123, the reversal of 123 would be 321. What math topic or Algebra topic deals with this? Thank you. 123 = 100+20+3 abc = 100a+10b+c cba = 100c+10b+a input --> a b c output --> c b a abcd...n_m where m is the mth integer in the string of numbers and n is the last number in the example above m = 3 and n = 3. n is the mth number of 3 is the 3rd number in 123 in 232425 5 is the 6th number in the string 232425. m=6 and n=5 abcd...xyzn_m = 10^(m-1)a+10^(m-2)b+10^(m-3)c+10^(m-4)d+...+10^(3)x+10^(2)y+10^(1)z+n nzyx...dcba_1. = 10^(m-1)n+10^(m-2)z+10^(m-3)y+10^(m-4)x+...+10^(3)d+10^(2)c+10^(1)b+a
 January 31st, 2011, 06:34 AM #2 Global Moderator   Joined: Dec 2006 Posts: 20,820 Thanks: 2159 If you are interested in 123 and 321 as numerical values, the number base (by default, 10) matters and I would be inclined to select number theory rather than algebra.
 January 31st, 2011, 06:52 AM #3 Global Moderator     Joined: Nov 2009 From: Northwest Arkansas Posts: 2,766 Thanks: 4 Re: What topic in math deals with reverse numbers? You might be interested in the wikipedia entries on "palindromic numbers" and the "lychrel process"

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