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A268854
a(n) is the smallest magic sum of any 3 X 3 magic square which contains exactly n triangular numbers.
4
39, 24, 21, 15, 18, 24, 189, 67734
OFFSET
0,1
LINKS
Andrew Bremner, On squares of squares II, Acta Arithmetica 99 (2001), pp. 289-308.
Multimagic Squares, An unsolved problem
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
CROSSREFS
KEYWORD
nonn,fini,hard,more
AUTHOR
STATUS
approved