A308094 Arrange distinct numbers in a single square spiral so that the absolute difference between each number and its eight neighbors is unique.
1, 2, 4, 8, 13, 21, 10, 31, 17, 34, 52, 26, 45, 68, 41, 66, 97, 131, 57, 96, 50, 139, 69, 114, 165, 83, 219, 107, 168, 102, 158, 221, 136, 198, 265, 166, 3, 237, 309, 386, 183, 261, 140, 349, 240, 319, 411, 270, 363, 179, 461, 322, 426, 279, 381, 488, 6, 364
Offset: 1
Keywords
Examples
The spiral begins:
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673--476--896--714--200--610--848--660--181--831--180
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877 125--280--513--393----9--336--481--364----6 658
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1085 429 3--166--265--198--136--221--158 488 187
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770 554 237 97---66---41---68---45 102 381 647
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232 7 309 131 13----8----4 26 168 279 18
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743 523 386 57 21 1----2 52 107 426 584
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964 14 183 96 10---31---17---34 219 322 12
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1182 405 261 50--139---69--114--165---83 461 842
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765 539 140--349--240--319--411--270--363--179 680
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233 5--685--499---11--572---16--565---19--514---15
Comments