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One of the consequences of 180 having so many divisors is that it is a practical number, meaning that any positive number smaller than 180 that is not a divisor of 180 can be expressed as the sum of some of 180's divisors. 180 is a Harshad number and a refactorable number. [5] 180 is the sum of two square numbers: 12 2 + 6 2. It can be ...
It is found dissolved in seawater (which is 0.04% potassium by weight), [10] [11] and occurs in many minerals such as orthoclase, a common constituent of granites and other igneous rocks. [12] Potassium is chemically very similar to sodium, the previous element in group 1 of the periodic table.
A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.
The following list includes a decimal expansion and set containing each number, ordered by year of discovery. The column headings may be clicked to sort the table alphabetically, by decimal value, or by set. Explanations of the symbols in the right hand column can be found by clicking on them.
The first ordinal number that is not a natural number is expressed as ω; this is also the ordinal number of the set of natural numbers itself. The least ordinal of cardinality ℵ 0 (that is, the initial ordinal of ℵ 0 ) is ω but many well-ordered sets with cardinal number ℵ 0 have an ordinal number greater than ω .
Substances in the chain-melted state display properties of both a solid and a liquid. [3] [7] The co-author of a study regarding the chain-melted state, Andreas Hermann, stated that if the matter were hypothetically to be handled by a person, it would be like holding a wet sponge that is leaking water, while the sponge itself is actually made of water. [8]
Eating a variety of foods that contain potassium is the best way to get an adequate amount. Foods with high sources of potassium include kiwifruit, orange juice, potatoes, coconut, avocados, apricots, parsnips and turnips, although many other fruits, vegetables, legumes, and meats contain potassium. Common foods very high in potassium: [34]
A factorial x! is the product of all numbers from 1 to x. The first: 1, 2, 6, 24, 120, 720, 5040, 40320, 362880, 3628800, 39916800, 479001600 (sequence A000142 in the OEIS). 0! = 1 is sometimes included. A k-smooth number (for a natural number k) has its prime factors ≤ k (so it is also j-smooth for any j > k).