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A268855 a(n) = smallest magic sum of any 3 X 3 magic square which contains exactly n squares. 5
30, 21, 18, 15, 39, 120, 435, 541875 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

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

LINKS

Table of n, a(n) for n=0..7.

Andrew Bremner, On squares of squares II, Acta Arithmetica 99 (2001), pp. 289-308.

Multimagic Squares, Magic squares of squares

The Prime Puzzles and Problems Connection, Problem 63

The Prime Puzzles and Problems Connection, Puzzle 79

Arkadiusz Wesolowski, Examples of these magic squares

Wikipedia, Magic square

Index entries for sequences related to magic squares

CROSSREFS

Cf. A221669, A268854, A268856, A269231.

Sequence in context: A033971 A193220 A040872 * A117749 A283621 A100935

Adjacent sequences:  A268852 A268853 A268854 * A268856 A268857 A268858

KEYWORD

nonn,fini,hard,more

AUTHOR

Arkadiusz Wesolowski, Feb 14 2016

STATUS

approved

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Last modified July 9 05:17 EDT 2020. Contains 335538 sequences. (Running on oeis4.)