The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A240922 Magic constants of associative 4 X 4 X 4 cubes composed of distinct prime numbers. 1
 1260, 1320, 1380, 1428, 1440, 1500, 1560, 1596, 1620 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS A magic cube is associative if the sum of its any two elements that are symmetric about the cube center equals the same number, called the associativity constant of the cube. All magic 3 X 3 X 3 cubes are associative. REFERENCES Andrews W. S. Magic Squares & Cubes, Dover Publ, 1960 (original publication Open Court, 1917) William H. Benson and Oswald Jacoby. Magic Cubes. New Recreations. 1981. Gakuho Abe, Related Magic Squares with Prime Elements, JRM 10:2 1977-78, pp.96-97. A. W. Johnson, Jr., An Order 4 Prime Magic Cube, JRM 18:1, 1985-86, pp 5-7. LINKS Harvey Heinz, Prime Number Magic Cubes Natalia Makarova, Magic cubes corresponding to terms a(1)-a(6) Discussion in forum dxdy.ru (in Russian) EXAMPLE a(1)=1260 corresponds to the following cube:    23 521 433 283   373  29 457 401   587 139  11 523   277 571 359  53   ---------------   263 379 557  61   613  13 131 503   317 449  31 463    67 419 541 233   ---------------   397  89 211 563   167 599 181 313   127 499 617  17   569  73 251 367   ---------------   577 271  59 353   107 619 491  43   229 173 601 257   347 197 109 607 CROSSREFS Cf. A239671. Sequence in context: A215991 A288921 A099592 * A014575 A144563 A175746 Adjacent sequences:  A240919 A240920 A240921 * A240923 A240924 A240925 KEYWORD nonn,more AUTHOR Natalia Makarova, Aug 02 2014 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified April 18 10:56 EDT 2021. Contains 343087 sequences. (Running on oeis4.)