Various possible columns.

Paterson's Worms

In 1970, John Conway, Mike Beeler, and Mike Paterson studied programmic worms, but they couldn't figure out how a few of them behaved. In 2003, Benjamin Chaffin finally answers their question.

Square free numbers

The amazing properties of the Möbius function, and an interesting method for guessing whether a number is prime.

Mrs. Perkins Quilts

Martin Gardner, John Conway, and Richard Guy have their various solutions topped by today's desktop computers. With new solutions by Al Zimmermann and Lance Gay.

cubic graphs

http://ginger.indstate.edu/ge/Graphs/index.html

http://mathworld.wolfram.com/SymmetricCubicGraph.html

Konigsberg's Bridges

http://www.matheory.info/konigsberg/

http://mathworld.wolfram.com/KoenigsbergBridgeProblem.html

Gaussian Integers

http://www.mathpuzzle.com/Gaussians.html

Crosswords

different types of computer searches

Large Polyform Solutions

different types of computer searches.

Mathematical Constants

http://pauillac.inria.fr/algo/bsolve/constant/constant.html

folding tissue paper 12 times and folding tetrahedra (Naoaki)

http://www.osb.net/Pomona/12times.htm

Integer Triangles

http://www.mathpuzzle.com/itgrand.html

The Icosahedral Group, Polynomial roots, and the snubs.

http://mathworld.wolfram.com/IcosahedralGroup.html

http://mathworld.wolfram.com/SnubDodecahedron.html

Cube Problems

livecube.com

Crossnumber problems, how to make and solve them.

Triangle Centers.

Futurama, the Simpsons, Cubes, and Manifolds.

kleinbottle.com and knots

Fun with binders, pancakes, Les Shader, and Bill Gates

51 star flags

Find a polyhedron with edges measuring 1-n.

Square Crossnumber

Exclude trominoes on a 6x6 board

Minimize triples on a dart board

Rooms with sides 1-10 5 6 1 10 2 9 3 8

cyclic multiplication 102564 142857

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