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Topic: Centered number

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	What's Special About This Number?
		is the number of planar partitions of 10.
		is the number of planar partitions of 11.
		is the number of planar partitions of 12.
	www.stetson.edu /~efriedma/numbers.html (7473 words)

	Centered hexagonal number - Wikipedia, the free encyclopedia (Site not responding. Last check: 2007-11-04)
		A centered hexagonal number, or hex number is a centered figurate number that represents a hexagon with a dot in the center and all other dots surrounding the center dot in a hexagonal lattice.
		Viewed from the opposite perspective, centered hexagonal numbers are differences of two consecutive cubes, so that the centered hexagonal numbers are the gnomon of the cubes.
		In particular, prime centered hexagonal numbers are cuban primes.
	en.wikipedia.org /wiki/Centered_hexagonal_number (337 words)

	Centered Hexamorphic Numbers by Cliff Pickover (Site not responding. Last check: 2007-11-04)
		They describe the number of grid points in nested concentric hexagonal lattices.
		A centered hexagonal number is called "centered hexamorphic" if it terminates with its associated centered hexagonal integer.
		A convenient notation a_5 = aaaaa can be employed where the subscript indicates the number of times the digit or group appears consecutively.
	sprott.physics.wisc.edu /pickover/clifft.html (124 words)

	Table of Figurate Numbers, Sorted, Through 10,000
		Hendecagonal Number, or 11-gonal number, Hen(16), hence the Heterogeneous Jonathan Number Hen(S(4))
		Hendecagonal Number, or 11-gonal number, Hen(25), hence the Heterogeneous Jonathan Number Hen(S(5))
		the 18-gonal Number 18gon(25), hence the Heterogeneous Jonathan Number 18gon(S(5))
	www.magicdragon.com /fig.html (10985 words)

	Centered number - Wikipedia, the free encyclopedia (Site not responding. Last check: 2007-11-04)
		Centred numbers are class of series of figurate numbers, each formed by a central dot, surrounded by polygonal layers with a constant number of sides.
		Just as is the case with regular polygonal numbers, the first centered k-gonal number is 1.
		Whereas a prime number p cannot be a regular polygonal number (except of course the second k-agonal number), primes occur often enough in the sequences of centered polygonal numbers.
	en.wikipedia.org /wiki/Centered_number (219 words)

	Sunspot Number Archives
		Click here for a plot of all monthly-averaged sunspot numbers from the year 1749 through the present.
		The Space Environment Services Center (SESC) sunspot number for the indicated date is from the daily Solar Region Summary issued by SESC.
		The SESC sunspot number is computed according to the Wolf Sunspot Number R=k (10g+s), where g is the number of sunspot groups (regions), s is the total number of individual spots in all the groups, and k is a variable scaling factor (usually
	www.spaceweather.com /java/archive.html (172 words)

	Table of Polytope Numbers, Sorted, Through 1,000,000
		It is also the first of an infinite number of multidimensional Polytope Numbers such as the Pentatope (4-Simplex or Hypertetrahedron), Hyperoctahedron, 24-cell, Hyperdodecahedron, and Hypericosahedron -- these Polytope numbers are the subject of recent papers by this author, see References.
		[3rd "uninteresting number"] the 52-gonal Pyramidal Number 52Pyr(2), the 51-dimensional Centered Tetrahedral Number 51dCT(2)
		Hendecagonal Number, or 11-gonal number, Hen(26); also the Heptagonal Number Hep(36), note that the two digits of the index (36) are also the first and last digit of the Heptagonal Number (base 10)
	www.magicdragon.com /poly.html (9059 words)

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