cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-2 of 2 results.

A189121 The constant for the smallest n X n associative magic square which consists of Smith numbers.

Original entry on oeis.org

822, 14560, 12170, 14280, 64288
Offset: 3

Views

Author

Natalia Makarova, Apr 17 2011

Keywords

Comments

In the associative magic square the sums of every pair of elements which are center-symmetrical are equal. Associative squares exist for every magic square order.

Examples

			n = 6, S = 14280
  [ 2722 2326 1255 2965  958 4054
    2182  391 2902 3865 4306  634
    4198 2605 2839  166   58 4414
     346 4702 4594 1921 2155  562
    4126  454  895 1858 4369 2578
     706 3802 1795 3505 2434 2038 ]
.
n = 7, S = 64288
  [  346 18274  1219 10966  2182 16735 14566
   16474   121 13666  3946 16726 12442   913
    1282 17833  7762 15646  9274   706 11785
   18346  2839 14719  9184  3649 15529    22
    6583 17662  9094  2722 10606   535 17086
   17455  5926  1642 14422  4702 18247  1894
    3802  1633 16186  7402 17149    94 18022 ]

References

  • Magic square of order 3: see the book: M. Gardner. From the Penrose tilings to securely encrypted, 1993.

Links

Crossrefs

Cf. A104170, A170928, A188537.

A213689 Smallest magic sum of an order-n magic square composed of consecutive Smith numbers.

Original entry on oeis.org

252416863614, 10949070196804, 8719491322, 3873, 5551, 6496, 9179, 15681, 20978, 26062, 28301, 35936, 50560, 55330, 66877, 88738, 94465, 111840, 128860, 177659, 179929, 230580, 261107, 275220, 300070, 361843, 395338, 457169, 446645, 505470, 560168
Offset: 3

Views

Author

Max Alekseyev, Jun 18 2012

Keywords

Examples

			3 X 3 magic square:
  84138954584 84138954498 84138954532
  84138954486 84138954538 84138954590
  84138954544 84138954578 84138954492
4 X 4 magic square:
  2737267549028 2737267549166 2737267549330 2737267549280
  2737267549305 2737267549265 2737267549134 2737267549100
  2737267549186 2737267549105 2737267549300 2737267549213
  2737267549285 2737267549268 2737267549040 2737267549211

Links

Crossrefs

Cf. A006753, A170928, A189121.
Showing 1-2 of 2 results.

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