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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 continued fraction corresponding counters cryptanalyst CRYPTOGRAPHY cube cyclical permutation D. H. Lehmer denote described determined diagonal diagram digits digraphs discs districts divided dodecahedron dominoes edges equal equivalent Euler's Eulerian square example faces figure four geometrical girls give given Hence icosahedron instance integers Latin squares letters lines magic square Mathematical Messenger of Mathematics method move multiple obtained octahedron odd nodes odd number pack pairs pandiagonal path pentagon Petrie polygon pieces pile placed plain-text plane polygon polyhedron position possible prime problem queens questions re-entrant rectangle regular regular polygons remaining result ring route rule sides similar Similarly solution steps suffixes suppose symmetrical tessellation tetrahedra theorem three-step triangles triplets unicursal vertex vertices