Woodall Number
Numbers of the form
The first few are 1, 7, 23, 63, 159, 383, ... (Sloane's A003261). The only Woodall numbers
for 
which arePrime are for 
, 7755, 9531, 12379, 15822, 18885, 22971, 23005, 98726, ... (Sloane's A014617; Ballinger).See also Cullen Number, Cunningham Number, Fermat Number, Mersenne Number,Sierpinski Number of the First Kind
References
Ballinger, R. ``Cullen Primes: Definition and Status.'' http://vamri.xray.ufl.edu/proths/cullen.html.
Guy, R. K. ``Cullen Numbers.'' §B20 in Unsolved Problems in Number Theory, 2nd ed. New York: Springer-Verlag, p. 77, 1994.
Leyland, P. ftp://sable.ox.ac.uk/pub/math/factors/woodall.
Ribenboim, P. The New Book of Prime Number Records. New York: Springer-Verlag, pp. 360-361, 1996.
Sloane, N. J. A. SequencesA014617 andA003261/M4379in ``An On-Line Version of the Encyclopedia of Integer Sequences.''http://www.research.att.com/~njas/sequences/eisonline.html and Sloane, N. J. A. and Plouffe, S.The Encyclopedia of Integer Sequences. San Diego: Academic Press, 1995.
- Topological Dimension
- Topological Entropy
- Topological Groupoid
- Topologically Conjugate
- Topologically Transitive
- Topological Manifold
- Topological Space
- Topological Vector Space
- Topology
- Topos
- Toric Variety
- Torispherical Dome
- Torn Square Fractal
- Toroid
- Toroidal Coordinates
- Toroidal Field
- Toroidal Function
- Toroidal Harmonic
- Toroidal Polyhedron
- Toronto Function
- Torricelli Point
- Torsion (Differential Geometry)
- Torsion (Group Theory)
- Torsion Number
- Torsion Tensor