Euclid Number
The 
th Euclid number is defined by
where
is the 
th Prime. The first few 
are 3, 7, 31, 211, 2311, 30031, 510511, 9699691, 223092871, 6469693231,... (Sloane's A006862). The largest factor of are 3, 7, 31, 211, 2311, 509, 277, 27953, ... (Sloane's A002585). The of the first few Prime Euclid numbers are 1, 2, 3, 4, 5, 11, 75, 171, 172, 384, 457, 616, 643, ... (Sloane's A014545)up to a search limit of 700. It is not known if there are an Infinite number of Prime Euclid numbers (Guy 1994,Ribenboim 1996).See also Smarandache Sequences
References
Guy, R. K. Unsolved Problems in Number Theory, 2nd ed. New York: Springer-Verlag, 1994. Ribenboim, P. The New Book of Prime Number Records. New York: Springer-Verlag, 1996. Sloane, N. J. A. SequencesA014545,A006862/M2698, andA002585/M2697,in ``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. Wagon, S. Mathematica in Action. New York: W. H. Freeman, pp. 35-37, 1991.
- Clothoid
- Clove Hitch
- Clump
- Cluster
- Cluster Perimeter
- C-Matrix
- Coanalytic Set
- Coastline Paradox
- Coates-Wiles Theorem
- Coaxal Circles
- Coaxaloid System
- Coaxal System
- Cobordant Manifold
- Cobordism
- Cobordism Group
- Cobordism Ring
- Cochleoid
- Cochleoid Inverse Curve
- Cochloid
- Cochran's Theorem
- Cocked Hat Curve
- Cocktail Party Graph
- Coconut
- Codazzi Equations
- Code