Keyword Analysis & Research: 30

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What is the meaning of 30?

Age 30[edit] The minimum age for United States senators. In some regions of the continental United States, the 30th birthday is celebrated by gifting sticks. [citation needed] In other fields[edit] Thirtyis: Used (as –30–) to indicate the end of a newspaper (or broadcast) story, a copy editor's typographical notation

Is 30 a natural number?

30(thirty) is the natural numberfollowing 29and preceding 31. In mathematics[edit] 30 is a square pyramidal number. 30 is an even, composite, pronic number. With 2, 3, and 5as its prime factors, it is a regular numberand the first sphenic number, the smallest of the form 2×3×r{\displaystyle 2 imes 3 imes r}, where ris a prime greater than 3.

Is 30 a perfect number?

Adding up some subsets of its divisors (e.g., 5, 10 and 15) gives 30, hence 30 is a semiperfect number. 30 is the largest number such that all coprimes smaller than itself, except for 1, are prime. A polygon with thirty sides is called a triacontagon. The icosahedron and the dodecahedron are Platonic solids with 30 edges.

Is 30 a Harshad number?

30 is a Harshad number. Since any group G such that |G| = p nm, where p does not divide m, has a subgroup of order p n, and 30 is the only number less than 60 that is not either a prime or of the above form, it is the only candidate for the order of a simple group less than 60 that one needs other methods to reject.

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