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Problems with a Series of Numbered Things
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alphabet angle Archimedean solids arithmetic arrangement Bachet calculating cells centre chess-board cipher circle colours column consecutive construction containing corresponding counters cryptanalyst CRYPTOGRAPHY cube cyclical permutation D. H. Lehmer denote described determined diagonal diagram digits digraphs discs districts divided dodecahedron dominoes edges enantiomorphous equal equivalent Euler's Eulerian square example faces figure four fundamental solutions geometrical girls give given H. S. M. Coxeter Hence icosahedron instance integers Latin squares letters lines magic square Mathematical method move multiple obtained octahedron odd nodes odd number pack pairs pandiagonal path pentagon Petrie polygon pieces pile placed plain-text plane polygon polyhedra polyhedron position possible prime problem queens re-entrant rectangle regular remaining result ring route rule sides similar Similarly solution steps suffixes suppose symmetrical tessellation tetrahedra theorem triangles triplets unicursal vertex vertices