Talisman Square
An 
Array of the integers from 1 to 
such that the difference between any one integer and itsneighbor (horizontally, vertically, or diagonally, without wrapping around) is greater than or equal to some value 
is calleda 
-talisman square. The above illustrations show (4, 2)-, (4, 3)-, (5, 4)-, and (6, 8)-talisman squares.
References
Madachy, J. S. Madachy's Mathematical Recreations. New York: Dover, pp. 110-113, 1979.
Weisstein, E. W. ``Magic Squares.'' Mathematica notebook MagicSquares.m.
- Range (Line Segment)
- Range (Statistics)
- Rank
- Rank (Group)
- Rank (Quadratic Form)
- Rank (Sequence)
- Rank (Statistics)
- Rank (Tensor)
- Ranunculoid
- RAT-Free Set
- Ratio
- Ratio Distribution
- Rational Approximation
- Rational Canonical Form
- Rational Cuboid
- Rational Distances
- Rational Domain
- Rational Double Point
- Rational Function
- Rational Integer
- Rational Number
- Rational Point
- Rational Quadrilateral
- Rational Triangle
- Ratio Test