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A271450
a(n) = smallest magic sum of any 3 X 3 magic square which contains exactly n cubes, or 0 if no such magic square exists.
1
27, 18, 15, 42, 882
OFFSET
0,1
COMMENTS
For n >= 7, a(n) = 0 because the equation x^n + y^n = 2*z^n has no solution for n > 2 apart from the trivial x = y = z.
REFERENCES
Richard K. Guy, Unsolved Problems in Number Theory, New York: Springer-Verlag, 2004, pp. 268-271.
CROSSREFS
Cf. A269231.
Sequence in context: A317106 A033347 A173896 * A169733 A105325 A277270
KEYWORD
nonn,fini,hard,more
AUTHOR
STATUS
approved