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Numbers n for which nontrivial positive magic squares with magic sum n exist. For a definition of nontrivial positive magic squares, see A125005.
12

%I #3 Mar 31 2012 14:45:33

%S 15,18,21,24,27,30,33,34,36,38,39,42,45,46,48,50,51,54,57,58,60,62,63,

%T 65,66,69,70,72,74,75,78,80,81,82,84,85,86,87,90,93,94,95,96,98,99,

%U 100,102,105,106,108,110,111,114,115,117,118,120,122,123,125,126,129,130

%N Numbers n for which nontrivial positive magic squares with magic sum n exist. For a definition of nontrivial positive magic squares, see A125005.

%C This sequence lists all values s such that A125005(s) > 0.

%e a(1) = 15 because 15 is the smallest integer s for which a nontrivial positive magic square with magic sum s exists.

%Y Cf. A125005, A125007, A125008, A125009, A125010, A125011, A125012, A125013, A125014, A125015, A125016, A125017.

%K easy,nonn

%O 1,1

%A _Jens Voß_, Nov 15 2006