Brown Numbers
Brown numbers are Pairs 
of Integers satisfying the condition of Brocard'sProblem, i.e., such that
where
is the Factorial and 
is a Square Number. Only three such Pairs of numbersare known: (5,4), (11,5), (71,7), and Erdös conjectured that these are the only three such Pairs.See also Brocard's Problem, Factorial, Square Number, Wilson Prime
References
Guy, R. K. Unsolved Problems in Number Theory, 2nd ed. New York: Springer-Verlag, p. 193, 1994. Pickover, C. A. Keys to Infinity. New York: Wiley, p. 170, 1995.
- Confocal Conics
- Confocal Ellipsoidal Coordinates
- Confocal Parabolic Coordinates
- Confocal Paraboloidal Coordinates
- Conformal Latitude
- Conformal Map
- Conformal Solution
- Conformal Tensor
- Conformal Transformation
- Congruence
- Congruence Axioms
- Congruence (Geometric)
- Congruence Transformation
- Congruent
- Congruent Incircles Point
- Congruent Isoscelizers Point
- Congruent Numbers
- Congruum
- Congruum Problem
- Conic
- Conical Coordinates
- Conical Frustum
- Conical Function
- Conical Spiral
- Conical Wedge