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30 (thirty) is the natural number following 29 and preceding 31. In Mathematics, a natural number (also called counting number) can mean either an element of the set (the positive Integers or an 29 ( twenty-nine) is the Natural number following 28 and preceding 30. 31 ( thirty-one) is the Natural number following 30 and preceding 32.

0 10 20 30 40 50 60 70 80 90 →
Cardinal 30
thirty
Ordinal 30th
thirtieth
Numeral system trigesimal
Factorization 2\cdot 3\cdot 5
Divisors 1, 2, 3, 5, 6, 10, 15, 30
Roman numeral XXX
Roman numeral (Unicode) XXX, xxx
Binary 11110
Octal 36
Duodecimal 26
Hexadecimal 1E
Hebrew ל (Lamed)

Contents

In mathematics

It is a primorial as well as the sum of the squares of the integers 1, 2, 3 and 4. 29 ( twenty-nine) is the Natural number following 28 and preceding 30. 31 ( thirty-one) is the Natural number following 30 and preceding 32. 32 ( thirty-two) is the Natural number following 31 and preceding 33. 33 ( thirty-three) is the Natural number following 32 and preceding 34. 34 ( thirty-four) is the Natural number following 33 and preceding 35. 35 ( thirty-five) is the Natural number following 34 and preceding 36. 36 ( thirty-six) is the Natural number following 35 and preceding 37. 37 ( thirty-seven) is the Natural number following 36 and preceding 38. This article discusses the number thirty-eight. For the year 38 CE see 38. 39 ( thirty-nine) is the Natural number following 38 and preceding 40. 40 ( forty) is the Natural number following 39 and preceding 41. This is a list of articles about Numbers ( not about Numerals. The integers (from the Latin integer, literally "untouched" hence "whole" the word entire comes from the same origin but via French "Twenty" redirects here For the village in England, see Twenty Lincolnshire. 40 ( forty) is the Natural number following 39 and preceding 41. This article discusses the number fifty. For the year 50 CE see 50. 60 ( sixty) is the Natural number following 59 and preceding 61. 70 ( seventy) is the Natural number following 69 and preceding 71. 80 ( eighty) is the Natural number following 79 and preceding 81. 90 ( ninety) is the Natural number preceded by 89 and followed by 91. This article describes cardinal numbers in mathematics For cardinals in linguistics see Names of numbers in English. In Set theory, an ordinal number, or just ordinal, is the Order type of a Well-ordered set. A numeral system (or system of numeration) is a Mathematical notation for representing numbers of a given set by symbols in a consistent manner Base 30 or trigesimal is a positional numeral system using 30 as the Radix. In Mathematics, factorization ( also factorisation in British English) or factoring is the decomposition of an object (for In Mathematics, a divisor of an Integer n, also called a factor of n, is an integer which evenly divides n without Roman numerals are a Numeral system originating in ancient Rome, adapted from Etruscan numerals. The binary numeral system, or base-2 number system, is a Numeral system that represents numeric values using two symbols usually 0 and 1. The octal Numeral system, or oct for short is the base -8 number system and uses the digits 0 to 7 The duodecimal system (also known as base -12 or dozenal) is a Numeral system using twelve as its base. In Mathematics and Computer science, hexadecimal (also base -, hexa, or hex) is a Numeral system with a The primorial has two similar but distinct meanings The name is attributed to Harvey Dubner and is a Portmanteau of prime and Factorial It is the smallest Giuga number. A Giuga number is a Composite number n such that each of its distinct Prime factors p i is a divisor of {n \over p_i}

30 is the smallest sphenic number, and the smallest of the form 2\cdot 3\cdot r where r is a prime greater than 3. In Mathematics, a sphenic number ( Old Greek sphen = Wedge) is a positive integer which is the product of three distinct Prime 30 has an aliquot sum of 42 and all sphenic numbers of this form have an aliquot sum 12 greater than themselves. In Mathematics, and specifically in Number theory, a divisor function is an Arithmetical function related to the Divisors of an Integer In Mathematics, a sphenic number ( Old Greek sphen = Wedge) is a positive integer which is the product of three distinct Prime In Mathematics, and specifically in Number theory, a divisor function is an Arithmetical function related to the Divisors of an Integer The aliquot sequence of 30 is 16 members long, it comprises (30,42,54,66,90,144,259,45,33,15,9,4,3,1,0)

It is the sum of the first four squares, which makes it a square pyramidal number. In Mathematics, an aliquot sequence is a recursive sequence in which each term is the sum of the Proper divisors of the previous term In Mathematics, a pyramid number, or square pyramidal number, is a Figurate number that represents a Pyramid with a base and four sides Adding up some subsets of its divisors (e. g. , 5, 10 and 15) gives 30, hence 30 is a semiperfect number. In Mathematics, a semiperfect number or pseudoperfect number is a Natural number n that is equal to the sum of all or some of its Proper

30 is the largest number such that coprimes smaller than itself are also prime. In Mathematics, the Integers a and b are said to be coprime or relatively prime if they have no common factor other than [1]

A polygon with thirty sides is called a tricontagon. In Geometry a polygon (ˈpɒlɨɡɒn ˈpɒliɡɒn is traditionally a plane figure that is bounded by a closed path or circuit In Geometry a polygon (ˈpɒlɨɡɒn ˈpɒliɡɒn is traditionally a plane figure that is bounded by a closed path or circuit Both an icosahedron and a dodecahedron have 30 edges. In Geometry, an icosahedron ( Greek: eikosaedron, from eikosi twenty + hedron seat /ˌaɪ A dodecahedron is any Polyhedron with twelve faces but usually a regular dodecahedron is meant a Platonic solid composed of twelve regular Pentagonal

E8 has Coxeter number 30. In Mathematics, the Coxeter number h is the order of a Coxeter element of an irreducible Root system, Weyl group, or

30 is a Harshad number. A Harshad number, or Niven number, is an Integer that is divisible by the sum of its digits in a given number base.

In science

Astronomy


In other fields

Thirty is:

Historical years

30 A.D., 30 B.C., 1930, 2030, etc. Year 30 was a Common year starting on Sunday (link will display the full calendar of the Julian calendar. Year 30 BC was a Common year starting on Wednesday (link will display the full calendar of the Julian calendar. Year 1930 ( MCMXXX) was a Common year starting on Wednesday (link will display 1930 calendar of the Gregorian calendar. 2030 ( MMXXX) will be a Common year starting on Tuesday of the Gregorian calendar.

History and Literature

Sports

Music

Movies

References

  1. ^ Michael Slone, Every positive integer greater than 30 has at least one composite totative from PlanetMath. PlanetMath is a free, collaborative online Mathematics Encyclopedia. Accessed 24 April 2007
The Prime Pages is a website about Prime numbers maintained by Prof
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