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 A225133 Minimal index of order n Stanley's antimagic square composed of Smith numbers. 0
 4, 143, 669, 2088, 8318, 30885, 87643 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Stanley antimagic square of index d and order n is an n X n matrix where the sum of any n matrix elements in pairwise distinct rows and pairwise distinct columns equals d. LINKS Table of n, a(n) for n=1..7. Antimagic squares (in Russian), discussion at dxdy.ru Carlos Rivera Puzzle 681 EXAMPLE Examples of order n Stanley's antimagic squares with minimal index S composed of Smith numbers: . n=2, S=143 22 58 85 121 . For n=3, S=669 we have: 22 58 202 85 121 265 346 382 526 Here 22+121+526 = 22+265+382 = 58+265+346 = 58+85+526 = 202+121+346 = 202+85+382 = 669. . n=4, S=2088 85 94 121 517 346 355 382 778 526 535 562 958 654 663 690 1086 . n=5, S=8318 (author V. Pavlovsky) 58 121 382 562 1111 202 265 526 706 1255 454 517 778 958 1507 1858 1921 2182 2362 2911 3802 3865 4126 4306 4855 . n=6, S=30885 319 346 1642 1678 1966 3226 535 562 1858 1894 2182 3442 1255 1282 2578 2614 2902 4162 3595 3622 4918 4954 5242 6502 4279 4306 5602 5638 5926 7186 13639 13666 14962 14998 15286 16546 . n=7, S=87643 (author J. K. Andersen) 454 634 1858 2614 4054 4414 16474 1642 1822 3046 3802 5242 5602 17662 2038 2218 3442 4198 5638 5998 18058 5674 5854 7078 7834 9274 9634 21694 5935 6115 7339 8095 9535 9895 21955 20362 20542 21766 22522 23962 24322 36382 24214 24394 25618 26374 27814 28174 40234 CROSSREFS Cf. A006753, A210710. Sequence in context: A299833 A231949 A239248 * A122422 A307703 A277948 Adjacent sequences: A225130 A225131 A225132 * A225134 A225135 A225136 KEYWORD nonn,base,more AUTHOR Natalia Makarova, Apr 29 2013 STATUS approved

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Last modified May 29 01:10 EDT 2023. Contains 363029 sequences. (Running on oeis4.)