# New in *MathWorld* -- November
2005

### Wednesday November 30, 2005

- Ansatz (modified)
- Bernoulli Number (modified)
- Double Factorial (modified)
- Factorial (modified)
- Fermat Number (modified)
- Integer Sequence Primes (modified)
- Irregular Prime (modified)
- Lattice Embedding
- Mersenne Number (modified)
- Motzkin Number (modified)
- Peter-Weyl Theorem
- Powerful Number (modified)
- Prime Number (modified)
- Riemann Zeta Function (modified)
- Schoch Line (modified)
- Schröder Number (modified)
- Subfactorial (modified)
- Woo Circle (modified)

### Tuesday November 29, 2005

- Cartesian Curve
- Catalan Number (modified)
- Cullen Number (modified)
- Delannoy Number (modified)
- Fibonacci Prime (modified)
- Geometry (modified)
- Harmonic Number (modified)
- Integer Sequence Primes (modified)
- Irregular Prime (modified)
- Lucas Number (modified)
- Mandelbrot Set (modified)
- Matrix Minimal Polynomial (modified)
- Multiple Root (modified)
- Point (modified)
- Power Difference Prime
- Snark (modified)
- Woodall Number (modified)

### Monday November 28, 2005

- Addition-Multiplication Magic Square (modified)
- Prime Gaps (modified)
- Seifert Conjecture (modified)
- Sharpe Ratio (modified)
- SOHCAHTOA (modified)
- Sum-Free Set (modified)
- Sum-Product Number (modified)

### Sunday November 27, 2005

- Mandelbrot Set (modified)
- Unary Cofactor Triangle

### Thursday November 24, 2005

### Sunday November 20, 2005

- Gibert Point (modified)

### Saturday November 19, 2005

### Friday November 18, 2005

- Droussent Cubic
- Fermat Pseudoprime (modified)
- Gibert Point (modified)
- Johnson Circles (modified)
- Johnson Midpoint (modified)
- Johnson Triangle (modified)
- Lemoine Cubic
- Napoleon-Feuerbach Cubic (modified)
- Simson Cubic
- Tucker-Brocard Cubic
- Tucker Cubic

### Thursday November 17, 2005

- Central Circle (modified)
- Divisor Function (modified)
- Fermat Pseudoprime (modified)
- Johnson Circles (modified)
- Johnson Midpoint (modified)
- Johnson Triangle
- Kenmotu Circle
- Kenmotu Point (modified)
- Kiepert Hyperbola (modified)
- Longuet-Higgins Circle (modified)
- Moses-Longuet-Higgins Circle
- Orthocorrespondent
- Orthotransversal
- Parallelian (modified)
- Poulet Number (modified)
- Primality Test (modified)
- Tucker Circles (modified)

### Wednesday November 16, 2005

- Central Circle (modified)
- Equal Parallelians Point (modified)
- Fáry Embedding (modified)
- FundamentalDiscriminantQ
- Integer Sequence Primes (modified)
- Jerabek Center (modified)
- Johnson Midpoint
- Kiepert Center (modified)
- Longuet-Higgins Circle
- Longuet-Higgins Point (modified)
- Parallelian (modified)
- Schoute Center (modified)

### Tuesday November 15, 2005

- First Morley Triangle (modified)
- Gibert Point (modified)
- Hadamard Matrix (modified)
- Inner Soddy Circle (modified)
- Johnson Circles (modified)
- Napoleon Crossdifference
- Ordinary Line (modified)
- Outer Soddy Circle (modified)
- Parry Reflection Point
- Polynomial Discriminant (modified)
- Second Morley Adjunct Triangle
- Second Morley Triangle
- Selberg's Formula (modified)
- Steiner Circle (modified)
- Steiner Deltoid
- Third Morley Adjunct Triangle
- Third Morley Triangle
- Tixier Point

### Monday November 14, 2005

- Circum-Orthic Triangle (modified)
- Feller-Tornier Constant
- Fundamental Unit (modified)
- Gibert Point
- Hexagon (modified)
- Integer Sequence Primes (modified)
- Pisot Number (modified)
- Squarefree (modified)
- Tangential Mid-Arc Triangle (modified)

### Sunday November 13, 2005

- Anticomplementary Conjugate
- BCI Triangle (modified)
- Bicentric Sum
- Cevapoint
- Feuerbach Antipode
- First Mid-Arc Point
- Jerabek Antipode
- Jerabek Center
- Kiepert Antipode
- Kiepert Center
- Longuet-Higgins Point
- Mid-Arc Points (modified)
- Prasolov Point
- Schoute Center
- Second Mid-Arc Point
- Second Power Point
- Third Mid-Arc Point
- Third Power Point
- Trilinear Quotient
- Unipotent (modified)

### Friday November 11, 2005

- Brocard Triangles (modified)
- Circum-Medial Triangle (modified)
- D-Triangle (modified)
- Fourth Brocard Triangle
- Fuhrmann Triangle (modified)
- Second Brocard Triangle (modified)
- Tangential Triangle (modified)
- Third Brocard Triangle
- Tribonacci Number (modified)

### Thursday November 10, 2005

- Equal Parallelians Point (modified)
- Factorial Prime (modified)
- Parallelian
- Radiation Symbol Theorem

### Wednesday November 9, 2005

- Circum-Medial Triangle (modified)
- Consecutive Number Sequences (modified)
- Four-Color Theorem (modified)
- Gosper Island (modified)
- Lucas Central Triangle (modified)
- Lucas Inner Triangle (modified)
- One-Seventh Ellipse (modified)
- Orthic Triangle (modified)

### Tuesday November 8, 2005

- Anharmonic Section
- Anticomplementary Triangle (modified)
- Central Triangle (modified)
- Circumcircle Mid-Arc Triangle (modified)
- Circum-Medial Triangle (modified)
- Circumnormal Triangle (modified)
- Circum-Orthic Triangle (modified)
- Circumtangential Triangle (modified)
- Contact Triangle (modified)
- Cross-Ratio (modified)
- Diophantus's Riddle (modified)
- D-Triangle (modified)
- Equilateral Triangle (modified)
- Euler Triangle (modified)
- Excentral Triangle (modified)
- Extouch Triangle (modified)
- Feuerbach Triangle (modified)
- First Brocard Triangle (modified)
- First Morley Adjunct Triangle (modified)
- First Morley Triangle (modified)
- First Yff Circles Triangle (modified)
- Fold Catastrophe (modified)
- Four-Color Theorem (modified)
- Fuhrmann Triangle (modified)
- Hexyl Triangle (modified)
- Incentral Triangle (modified)
- Inner Napoleon Triangle (modified)
- Inner Vecten Triangle (modified)
- Lucas Central Triangle (modified)
- Lucas Inner Triangle (modified)
- Lucas Tangents Triangle (modified)
- Medial Triangle (modified)
- Mid-Arc Triangle (modified)
- Nome (modified)
- Orthic Triangle (modified)
- Outer Napoleon Triangle (modified)
- Outer Vecten Triangle (modified)
- Reflection Triangle (modified)
- Resultant (modified)
- RSA Number (modified)
- Second Brocard Triangle (modified)
- Second Yff Circles Triangle (modified)
- Stammler Triangle (modified)
- Steiner Triangle (modified)
- Tangential Mid-Arc Triangle (modified)
- Tangential Triangle (modified)
- Yff Central Triangle (modified)
- Yff Contact Circle (modified)

### Monday November 7, 2005

- Chebyshev's Theorem (modified)
- Cousin Primes (modified)
- Isosceles Tetrahedron (modified)
- One-Seventh Ellipse
- Planar Graph (modified)
- Positive Semidefinite Quadratic Form (modified)
- Prime Number Theorem (modified)
- Sexy Primes (modified)

### Thursday November 3, 2005

- Circumcenter (modified)
- Cylindrical Spiral
- Ellipsoid Packing (modified)
- Fractional Congruence
- Incenter (modified)
- Integer Sequence Primes (modified)
- Maximally Random Jammed
- Nine-Point Center (modified)
- Orthocenter (modified)
- Random Close Packing (modified)
- Spherical Spiral (modified)
- Symmedian Point (modified)
- Triangle Centroid (modified)
- Viviani's Curve (modified)
- Wieferich Prime (modified)
- Wolstenholme Prime

### Wednesday November 2, 2005

- Catalan's Conjecture (modified)
- Compact Set (modified)
- Concho-Spiral (modified)
- Cubic Close Packing (modified)
- Cubic Lattice
- Euler Line (modified)
- Factorial Prime (modified)
- Fatou's Lemma (modified)
- Gergonne Line (modified)
- Orthic Axis (modified)
- Postage Stamp Problem (modified)
- Propositional Calculus (modified)
- Soddy Line (modified)
- Wall-Sun-Sun Prime

### Tuesday November 1, 2005

- Cross-Ratio (modified)
- Cross Ratio (modified)
- Fuhrmann Triangle (modified)
- Pell Number (modified)
- Penrose Triangle (modified)
- Pi Wordplay (modified)
- Sierpiński Number of the Second Kind (modified)

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