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 A211172 A Sudoku torus. 1
 6, 5, 7, 3, 4, 2, 1, 9, 8, 9, 8, 1, 5, 6, 7, 4, 3, 2, 3, 2, 4, 8, 9, 1, 6, 5, 7, 5, 7, 6, 2, 3, 4, 9, 8, 1, 8, 1, 9, 7, 5, 6, 3, 2, 4, 2, 4, 3, 1, 8, 9, 5, 7, 6, 7, 6, 5, 4, 2, 3, 8, 1, 9, 1, 9, 8, 6, 7, 5, 2, 4, 3, 4, 3, 2, 9, 1, 8, 7, 6, 5 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The sequence is a listing for a Sudoku grid: 6 5 7 3 4 2 1 9 8 9 8 1 5 6 7 4 3 2 3 2 4 8 9 1 6 5 7 5 7 6 2 3 4 9 8 1 8 1 9 7 5 6 3 2 4 2 4 3 1 8 9 5 7 6 7 6 5 4 2 3 8 1 9 1 9 8 6 7 5 2 4 3 4 3 2 9 1 8 7 6 5 No two diagonally adjacent elements are the same. If the grid is rolled into a cylinder either way, this is still true making a 'Sudoku torus'. This extra information can be used to construct puzzles that use 'no diagonal' logic. The two lexicographical Sudoki in the cross-references have one internal diagonal each and several external diagonals. LINKS Mathworld, Sudoku Wikipedia, Sudoku EXAMPLE If a puzzle has say:    |x   5| ___|x then x cannot be 5. CROSSREFS Cf. A107739. Cf. A114288, A112454 (lexicographic grids). Sequence in context: A195786 A201330 A089826 * A152149 A196400 A086268 Adjacent sequences:  A211169 A211170 A211171 * A211173 A211174 A211175 KEYWORD nonn,fini,full,tabf AUTHOR Jon Perry, Jan 31 2013 STATUS approved

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Last modified October 19 22:00 EDT 2018. Contains 316378 sequences. (Running on oeis4.)