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A268855 a(n) = smallest magic sum of any 3 X 3 magic square which contains exactly n squares. 5

%I

%S 30,21,18,15,39,120,435,541875

%N a(n) = smallest magic sum of any 3 X 3 magic square which contains exactly n squares.

%C a(7) = 8*A268854(7) + 3.

%H Andrew Bremner, <a href="http://www.multimagie.com/Bremner2.pdf">On squares of squares II</a>, Acta Arithmetica 99 (2001), pp. 289-308.

%H Multimagic Squares, <a href="http://www.multimagie.com/English/SquaresOfSquares.htm">Magic squares of squares</a>

%H The Prime Puzzles and Problems Connection, <a href="http://www.primepuzzles.net/problems/prob_063.htm">Problem 63</a>

%H The Prime Puzzles and Problems Connection, <a href="http://www.primepuzzles.net/puzzles/puzz_079.htm">Puzzle 79</a>

%H Arkadiusz Wesolowski, <a href="/A268855/a268855.txt">Examples of these magic squares</a>

%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Magic_square">Magic square</a>

%H <a href="/index/Mag#magic">Index entries for sequences related to magic squares</a>

%Y Cf. A221669, A268854, A268856, A269231.

%K nonn,fini,hard,more

%O 0,1

%A _Arkadiusz Wesolowski_, Feb 14 2016

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Last modified August 13 06:22 EDT 2020. Contains 336442 sequences. (Running on oeis4.)