Multimagic cubes

 John-R. Hendricks (Regina, Saskatchewan, Canada, 1929 - Victoria, BC, Canada, 2007)

Why limit oneself to the 2 dimensions of the multimagic squares? The Canadian John-R. Hendricks, world's foremost expert on magic squares, has created in June 2000 the first known bimagic cube. So, this bimagic cube is also the first known multimagic cube. His remarkable cube is 25th-order (=25x25x25 sized), and contains all the numbers from 1 to 15,625. The magic sum is 195,325, and the bimagic sum is 2,034,700,525. Holger Danielsson has created a PDF document (510Kb) giving details of this cube. See the biography of John R. Hendricks. See also this other biography published in the Journal of Recreational Mathematics.

However, I have big doubts on the paternity of this cube. In his "The Magic Square Course", second edition 1992 (very limited distribution as was the first edition 1991, only photocopied at few samples), John-R. Hendricks wrote page 411 :
            "David M. Collison, in an unpublished paper, has constructed a bimagic cube of order 25 (....) but it takes too much space to show here."
Look at this page 411. We may think with this wording that John had really received the cube. And exactly the same order 25, a very strange coincidence! David M. Collison (1937 - 1991) was an Englishman living in Anaheim, California: often mentioned in "The Magic Square Course", he sent a lot of discoveries directly to John, and died one year before this second edition. When John published the cube in 2000, he strangely forgot to mention that David had previously constructed such a cube...

In 2003, new multimagic cubes have been constructed, thus giving now the following list of the smallest known cubes, for each multimagic level:

(*) All the cubes were created in 2003 by Christian Boyer, except this bimagic cube of order 25 created in 2000 by John R. Hendricks or before 1991 by David M. Collison.

The bimagic cube of order 16 uses the numbers from 0 to 4095. The magic sum is 32,760, and the bimagic sum is 89,445,720. The 256 rows, 256 columns, 256 pillars and 4 triagonals (= the 4 main space diagonals) are bimagic. Since it is not necessary in the definition of a standard magic cube, the 96 diagonals of the various squares making up the bimagic cube are not bimagic. Therefore they are magic. Thanks to Harvey Heinz (Canada), Aale de Winkel (Netherlands) and Walter Trump (Germany) who have verified the bimagic characteristics of the cube as soon as it was announced in January 2003.

The trimagic cube of order 64 uses the numbers from 0 to 262,143. The 4096 rows, 4096 columns, 4096 pillars and 4 triagonals are trimagic. The 384 diagonals are bimagic.

A trimagic cube of order 256 has also been created: it is "perfect", since all its diagonals are trimagic. This cube is a monster: it contains the numbers from 0 to 16,777,215, with for example the trimagic sum S3  = 302231418874861348454400. Thanks to Walter Trump (Germany) who has verified the trimagic characteristics of these cubes as soon as they were announced in February 2003.

Eric Weisstein (USA) checked also this perfect trimagic cube of order 256 using Mathematica on Dec 6, 2003 and confirmed its properties. The check took 30 minutes on a 1GHz Macintosh G4.

Then tetramagic cubes even more monstrous have been created, checked by Renaud Lifchitz (France) and Yves Gallot (France). See some details about these 2 persons in the hypercubes page.

About the perfect tetramagic cube 8192, its 67,108,864 rows, 67,108,864 columns, 67,108,864 pillars, 4 triagonals, and 49,152 diagonals are tetramagic. Its magic sums are :

• S1  = 2251799813681152
• S2  = 825293359521335050119065600
• S3  = 340282366919700523424090353056775929856
• S4  = 149657767662003894090216275236580155584753888727040

In the honour of the year 2003 when all the above multimagic cubes were created, all these cubes start with the number "2003" in their first corner!

In the September 2003 issue of Pour La Science, the French edition of Scientific American, we have published an article about the history of magic cubes and about the construction of our multimagic cubes. It is described for example that our perfect tetramagic cube of order 8,192 is:

• So big that, if you built it (imagine each cell as a small wooden die of 2cm x 2cm x 2cm where a number of 12 digits maximum is engraved), you may include within the cube... Notre-Dame de Paris!
• So big that, if you check 1,000 dice (= 1000 numbers) per second, you will need more than 17 years to check the whole cube.
• So big that, if you engrave on each die the name of each person currently living on the earth (instead of the used number), only 1% of the dice will be engraved! 99% of the dice will remain blank.

The perfect tetramagic cube of order 8,192 can easily include Notre-Dame de Paris!

An anecdocte found in the book Carrés Magiques au degré n, by Général Cazalas, 1934. Page 13, in the preface written by Auguste Aubry, we can read that Gaston Tarry was preparing "a panmagic and trimagic cube that he had not the time to achieve" before he died in 1913. There is alas no trace of this work!

The Général Cazalas, although smart enough to construct his 64th-order trimagic square, later failed in his attempt to construct a bimagic cube. It is interesting to note that it was precisely focused, like John-R. Hendricks and David M. Collison, on the order 25. Cazalas wrote in 1934 in Sphinx (pages 168-169):
            "... but the simplest bimagic cube is on the domain of the theory, because his order is too big: in a 25th-order cube, we even get only a very incomplete bimagic".
So, John-R. Hendricks / David M. Collison are proved to be more cunning than Cazalas!

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