It may help you quite a bit to realize that some linear algebra shows that all solutions are of the form:
x+y xz xy+z
x2y+z x x+2yz
x+yz x+z xy
By rotating and reflecting we can make the largest corner be x+y, and we can insist that xz > x2y+z. In this case we have 0 < z < y The condition that all values be in the range 1..26 is satisfied if 1 <= x2y+z < x+2yz <= 26. Uniqueness is satisfied if 2z != y.
We can actually make a stronger statement. If 2z < y, then the elements fall in the order x2y+z, xy, xy+z, xz, x, x+z, x+yz, x+y, x+2yz and if y < 2z then the elements fall in the order x2y+z, xy, xz, xy+z, x, x+yz, x+z x+y, x+2yz.
With this many conditions, it should not be hard to enumerate the magic squares up to symmetry. And with some cleverness, I believe you don't even have to enumerate them all.
Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
Read Where should I post X? if you're not absolutely sure you're posting in the right place.
Please read these before you post! —
Posts may use any of the Perl Monks Approved HTML tags:
 a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

For: 

Use: 
 &   & 
 <   < 
 >   > 
 [   [ 
 ]   ] 
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.

