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Topic: Sphenic number

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	What's special about this number? (5)
		is a triangular number: 1 + 2 + 3 + … + 19 + 20 + 21
		is the number of 7 by 7 symmetric permutation matrices.
		is a deficient number, and the number of planar partitions of 12.
	www.archimedes-lab.org /numbers/Num201_500.html (2492 words)

	PlanetMath: sphenic number
		The divisors of a sphenic number therefore are
		The largest known sphenic number at any time is usually the product of the three largest known Mersenne primes.
		This is version 4 of sphenic number, born on 2006-08-17, modified 2006-11-15.
	planetmath.org /encyclopedia/SphenicNumber.html (115 words)

	190 (number) - Wikipedia, the free encyclopedia
		One hundred ninety is a sphenic number and a Harshad number.
		It is a triangular number, a hexagonal number and a centered nonagonal number.
		195 = 3 5 13, sphenic number, sum of eleven consecutive primes (3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29 + 31 + 37), one of the few odd numbers to be surrounded on both sides by twin primes, Harshad number
	en.wikipedia.org /wiki/190_(number) (319 words)

	Polygonal number
		In mathematics, a polygonal number is a number that can be arranged as a regular polygon.
		Ancient mathematicians discovered that numbers could be arranged in certain ways when they were represented by pebbles or seeds.
		Polygons with higher numbers of sides, such as pentagons and hexagons, can also be represented as arrangements of dots (by convention 1 is the first polygonal number for any number of sides).
	publicliterature.org /en/wikipedia/p/po/polygonal_number.html (547 words)

	130 (number) - Encyclopedia Glossary Meaning Explanation 130 (number) (Site not responding. Last check: 2007-10-21)
		It is the 32nd prime number, and it is a palindromic prime as well as a permutable prime, since it permutes with one hundred thirteen and three hundred eleven.
		It is a Catalan number, a Harshad number, a pronic number and a composite number, and its factorization is
		This number is the sum of five consecutive prime numbers (19 + 23 + 29 + 31 + 37).
	www.encyclopedia-glossary.com /en/130-number.html (660 words)

	CONK! Encyclopedia: 114_(number) (Site not responding. Last check: 2007-10-21)
		One hundred fourteen is an abundant number, a sphenic number and a Harshad number.
		The atomic number of an element temporarily called ununquadium.
		The number of suras in the Qur'an, and the number of surat an-Nas
	www.conk.com /search/encyclopedia.cgi?q=114_(number) (126 words)

	Prime number - ExampleProblems.com
		A natural number that is greater than one and is not a prime is called a composite number.
		Prime numbers are of fundamental importance in number theory.
		The prime number theorem says that the proportion of primes less than x is asymptotic to 1/ln x (in other words, as x gets very large, the likelihood that a number less than x is prime is inversely proportional to the number of digits in x).
	www.exampleproblems.com /wiki/index.php/Prime_number (3311 words)

	70 (number): number 70 (Site not responding. Last check: 2007-10-21)
		70 is a Pell number and a Harshad number.
		It is the seventh pentagonal number and the fourth 13-gonal number, as well as a pentatope number.
		The Saros number of the solar eclipse series which began on -821 September 5 and ended on 676 February 19.
	wikipedia.openfun.org /70_(number) (322 words)

	Wikipedia: Seventy
		It is a composite number with the divisors being 2, 5, 7, 10, 14 and 35.
		It is a pentagonal number and a 13-agonal number.
		The number of elders assembled by Moses on God's command in the desert (Holy Bible, Numbers 11:16-30).
	www.factbook.org /wikipedia/en/s/se/seventy.html (121 words)

	Wikipedia: Thirty
		It is a primorial as well as the sum of the squares of the integers 1, 2, 3 and 4.
		The number of edges on the regular icosahedron and the regular dodecahedron.
		The house number of 30 St Mary Axe (The Gherkin)
	www.factbook.org /wikipedia/en/t/th/thirty.html (166 words)

	78 (number): (Site not responding. Last check: 2007-10-21)
		78 is a triangular number, and its factorization makes it a sphenic number.
		The Saros number of the solar eclipse series which began on -463 June 9 and ended on 817 July 18.
		The Saros number of the lunar eclipse series which began on -125 April 10 and ended on 1155 May 18.
	wikipedia.openfun.org /78_(number) (316 words)

	Sphenic number - Wikipedia, the free encyclopedia
		A sphenic number (Old Greek sphen = wedge) is a positive integer that is the product of three distinct prime factors.
		The Möbius function returns −1 when passed any sphenic number.
		The first few sphenic numbers are: 30, 42, 66, 70, 78, 102, 105, 110, 114, 130, 138, 154,...
	en.wikipedia.org /wiki/Sphenic_number (133 words)

	one hundred ten (Site not responding. Last check: 2007-10-21)
		It is a composite number, with its divisors being 2, 3, 4, 6, 9, 12, 18, 27, 36 and 54, makes it an abundant number, and its factorization:
		It is a composite number, and its factorization:
		In a Heronian tetrahedron, the length of whose sides are all rational numbers, 117 is the smallest possible length of the longest side.
	www.yourencyclopedia.net /One_hundred_ten.html (408 words)

	255 (number) - TheBestLinks.com - Bit, Byte, Central processing unit, Color, ... (Site not responding. Last check: 2007-10-21)
		This is the maximum value representable by an eight-digit binary number, and therefore the maximum representable by an unsigned 8-bit byte (the most common size of byte, also called octet), the smallest common variable size used in high level programming languages (bit being smaller, but rarely used for value storage).
		This number could be interpreted by a computer as -1 if a programmer is not careful about which 8-bit values are signed and unsigned, and the two's complement representation of -1 in a signed byte is equal to that of 255 in an unsigned byte.
		Other common numbers in computing include 127, 32767, 65535, 2147483647 and 4294967295—all of which are 2 raised to a power, minus 1.
	www.thebestlinks.com /255___28__number__29__.html (369 words)

	42 (number) (Site not responding. Last check: 2007-10-21)
		It is also the third 15-gonal number, a Catalan number, a meandric number, an open meandric number, a Harshad number and a self number.
		The Saros number of the lunar eclipse series which began on 1293 BC January 24 and ended on 59 April 15.
		The number of perfect squares formed by the grid at a 19x19 Go board, when the "squares" are slightly rectangular with the ratio 13/12, as required by tradition.
	www.tocatch.info /en/42_(number).htm (868 words)

	Reference.com/Encyclopedia/255 (number)
		It is a perfect totient number, the smallest such number to be neither a power of three nor thrice a prime.
		This is the maximum value representable by an eight-digit binary number, and therefore the maximum representable by an unsigned 8-bit byte (the most common size of byte, also called octet), the smallest common variable size used in high level programming languages (bit being smaller, but rarely used for value storage).
		This number could be interpreted by a computer as -1 if a programmer is not careful about which 8-bit values are signed and unsigned, and the two's complement representation of -1 in a signed byte is equal to that of 255 in an unsigned byte.
	www.reference.com /browse/wiki/255_(number) (626 words)

	Informat.io on 102 (Site not responding. Last check: 2007-10-21)
		102 is an abundant number and a sphenic number.
		It is the sum of four consecutive prime numbers (19 + 23 + 29 + 31).
		102 is the third base 10 polydivisible number, since 1 is divisible by 1, 10 is divisible by 2 and 102 is divisible by 3.
	www.informat.io /?title=102 (260 words)

	30 (number) - Open Encyclopedia (Site not responding. Last check: 2007-10-21)
		It is the first sphenic number and the first Giuga number.
		It is the sum of the first four squares, which makes it a square pyramidal number.
		30 is the largest number such that coprimes smaller than itself are also prime.
	open-encyclopedia.com /Thirty (259 words)

	30 (number) Information
		It is a primorial as well as the sum of the squares of the integers 1, 2, 3 and 4.
		It is the first sphenic number and the first Giuga number.
		The Saros number of the solar eclipse series which began on October 2, 2069 BC and ended on March 18, 572 BC.
	www.bookrags.com /wiki/30_(number) (484 words)

	math lessons - Sphenic number (Site not responding. Last check: 2007-10-21)
		The Möbius function returns when passed any sphenic number.
		The first few sphenic numbers are: 30, 42, 66, 70, 78, 102, 105, 110, 114, 130,...
		Sphenic numbers from On-Line Encyclopedia of Integer Sequences.
	www.mathdaily.com /lessons/Sphenic_number (107 words)

	66 (number) information - Search.com (Site not responding. Last check: 2007-10-21)
		66 is a sphenic number, a triangular number, a hexagonal number, and a semi-meandric number.
		The Saros number of the solar eclipse series which began on -756 March 12 and ended on 542 May 1.
		The Saros number of the lunar eclipse series which began on -671 August 12 and ended on 826 January 27.
	domainhelp.search.com /reference/66_(number) (315 words)

	Prime number Summary
		For a long time, prime numbers were thought as having no possible application outside of number theory; this changed in the 1970s when the concepts of public-key cryptography were invented, in which prime numbers formed the basis of the first algorithms such as the RSA cryptosystem or the Diffie-Hellman key-exchange algorithm.
		The Copeland-Erdős constant 0.235711131719232931374143..., obtained by concatenating the prime numbers, is known to be an irrational number.
		For a long time, number theory in general, and the study of prime numbers in particular, was seen as the canonical example of pure mathematics, with no applications outside of the self-interest of studying the topic.
	www.bookrags.com /Prime_number (7095 words)

	Articles - 138 (number) (Site not responding. Last check: 2007-10-21)
		It is also the number of stellations of the Triakis tetrahedron.
		The Saros number of the solar eclipse series which began on 1472 June 6 and will end on 2716 July 11 The duration of Saros series 138 is 1244.0 years, and it contains 70 solar eclipses.
		The Saros number of the lunar eclipse series which began on 1503 October 5 and will end on 2982 March 30.
	www.wathcesa.com /articles/138_(number) (286 words)

	SingaporeMoms - Parenting Encyclopedia - 8 (number) (Site not responding. Last check: 2007-10-21)
		It is a composite number, its proper divisors being 1, 2, and 4.
		The Saros number of the solar eclipse series which began on -2579 March 7 and ended on -1281 April 26.
		The Saros number of the lunar eclipse series which began on -2512 July 27 and ended on -961 February 13.
	www.singaporemoms.com /parenting/8th (876 words)

	Articles - 500 (number) (Site not responding. Last check: 2007-10-21)
		This number is the magic constant of nÃ—n magic square and n-Queens Problem for n = 10.
		The number of keyboard sonatas written by Domenico Scarlatti, according to the catalog by Ralph Kirkpatrick.
		the model number of the 555 timer IC, a classic integrated circuit (chip) implementing a variety of timer and multivibrator applications, and historically widely used in electronics.
	www.scannera.com /articles/500_(number) (1532 words)

	Read about 190 (number) at WorldVillage Encyclopedia. Research 190 (number) and learn about 190 (number) here! (Site not responding. Last check: 2007-10-21)
		One hundred ninety is a sphenic number and a
		197 = prime number, sum of the first twelve primes, sum of seven consecutive primes (17 + 19 + 23 + 29 + 31 + 37 + 41), centered heptagonal number,
		199 = prime number, sum of three consecutive primes (61 + 67 + 71), sum of five consecutive primes (31 + 37 + 41 + 43 + 47), Lucas number,
	encyclopedia.worldvillage.com /s/b/190_(number) (264 words)

	COMPOSITE NUMBER Articles A composite number is a positive in
		The numbers zero and one are considered to be neither prime nor composite.
		A composite number with two prime factors is a semiprime or 2-almost prime (the factors need not be distinct, hence squares of primes are included).
		A composite number with three distinct prime factors is a sphenic number.
	www.amazines.com /Composite_number_related.html (621 words)

	Articles - 800 (number) (Site not responding. Last check: 2007-10-21)
		Ã— 5 Ã— 41, triangular number, Harshad number
		This number is the magic constant of nÃ—n magic square and n-Queens Problem for n = 12.
		Ã— 5 Ã— 11, Harshad number; 148-gonal number; the number of nÃ—n magic squares for n = 4.
	www.kimia-sains.com /articles/800_(number) (1108 words)

	Reference.com/Encyclopedia/Sphenic number
		In mathematics, a sphenic number (Old Greek sphen = wedge) is a positive integer which is the product of three distinct prime numbers.
		All sphenic numbers are by definition squarefree, because the prime factors must be distinct.
		The first case of two consecutive integers which are sphenic numbers is 230 = 2×5×23 and 231 = 3×7×11.
	www.reference.com /browse/wiki/Sphenic_number (284 words)

	Upto11.net - Wikipedia Article for 900 (number)
		It is the square of 30 and a Harshad number.
		In Greek number symbols Sampi ("Great Pi" ostensibly from the visual resemblance to the greek letter), which is signified by a convex horisontal arc with two parallel vertical lines below.
		In some parts of the world, such as the UK and Commonwealth countries, 999 (pronounced as 9-9-9) is the emergency telephone number; it is as of 2004 being quickly supplemented, by the international emergency number 112 and the North American 911 (number).
	www.upto11.net /generic_wiki.php?q=900 (815 words)

	Number Gossip: 30 (Site not responding. Last check: 2007-10-21)
		30 is the first sphenic number, that is the smallest number with 3 distinct prime divisors
		The number n is evil if it has an even number of 1's in its binary expansion.
		The number n is practical if all numbers strictly less than n are sums of distinct divisors of n.
	www.numbergossip.com /30 (191 words)

	800 (number) - TheBestLinks.com - Cardinal number, Eight queens puzzle, Hexadecimal, Hawaii, ... (Site not responding. Last check: 2007-10-21)
		This number is the magic constant of nxn magic square and n-Queens Problem for n = 12.
		This is the number of nxn magic squares for n = 4.
		881 prime number, sum of nine consecutive primes (79 + 83 + 89 + 97 + 101 + 103 + 107 + 109 + 113)
	www.thebestlinks.com /800___28__number__29__.html (1033 words)

	500 (number) information - Search.com
		This number is the magic constant of n×n magic square and n-Queens Problem for n = 10.
		The number of keyboard sonatas written by Domenico Scarlatti, according to the catalog by Ralph Kirkpatrick.
		582 = 2 × 3 × 97, sphenic number, sum of eight consecutive primes (59 + 61 + 67 + 71 + 73 + 79 + 83 + 89), nontotient
	domainhelp.search.com /reference/500_(number) (1551 words)

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