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Exponent Crossed Power (Posted on 2009-03-18) Difficulty: 3 of 5
Determine all possible pair(s) (X, Y) of positive integers that satisfy this equation.

                                        XXX = YY

Note: The order of calculation in XXX is as given in this article.

No Solution Yet Submitted by K Sengupta    
Rating: 4.0000 (1 votes)

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No Subject | Comment 7 of 10 |

I found the link confusing. It seems to say that a "tower" of abc is to be read as a^^(b*c), assuming the dot operator is multiplication.  I would have thought the likely confusion would be between (a^^b)^^c   and  a^^(b^^c).  Phrases like "right to left" and "top down" are not self-explanatory on this.  I would assume that right to left, or top down would be the latter of these expressions, but the illustrated examples are not clear (to me).

In any case, I think that IF there is a solution other than (1,1), it would most likely be if x and y each were of 10^^n format. Then the three-term and the two-term expressions would each be a single "1" followed by a number of "0"s.  (I am accustomed to the COBOL exponent operator "**" rather than "^^".)  Would the problem be more amenable to search if all operations were performed on binary operands?


Edited on March 18, 2009, 7:42 pm
  Posted by ed bottemiller on 2009-03-18 19:38:19

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