A268854 a(n) is the smallest magic sum of any 3 X 3 magic square which contains exactly n triangular numbers.
39, 24, 21, 15, 18, 24, 189, 67734
Offset: 0
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
- Index entries for sequences related to magic squares