Math Magic Touching Archive
Tiling Reptiles Packing Squares Circles Covering Touching Graphs Numbers Digits Matrices Chess Games Other
1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020

Convex Spectra
(April 1999)

updated 4/13/21

Surround Numbers
(May 1999)

updated 3/5/02

Tilings with N Neighbors
(July 2001)

updated 8/12/01

Entangled Polyominoes
(October 2001)

updated 12/21/02

Pairwise Touching Polycubes
(September 2003)

updated 9/11/03

Neighborly Tilings
(December 2004)

updated 6/28/18

No-Touch Tilings
(July 2005)

updated 7/30/05

Shapes Touching
n Others
(November 2005)

updated 11/29/05

Tree-Like Buildings
(October 2006)

updated 12/3/06

Rotating Rectangles in Boxes
(May 2009)

updated 5/22/09

Touch Cycles
(March 2015)

updated 3/11/15

Polyominoes Touching
n Times Their Area
(July 2016)

updated 11/21/19

Two Types of Polyominoes
Touching Certain Areas
(October 2016)

updated 4/15/19

Decreasing Square Paths
(March 2017)

updated 3/22/17

Neighbor Sets of States
(August 2017)

updated 8/27/17

N-ary Circle Trees
(May 2018)

updated 5/1/18

Neighborly Squares
(July 2018)

updated 9/29/18

More Polyomino Problems
(December 2018)

updated 12/16/18

Specific Touching of
1-, 2-, and 3-ominoes
(May 2019)

updated 6/25/19

Square Tilings with
Adjacency Signatures
(October 2019)

updated 10/14/19

Polyomino Tilings with
Adjacency Signatures
(November 2019)

updated 11/1/19