Colossally Abundant Number

In mathematics, a colossally abundant number (sometimes abbreviated as CA) is a natural number that, in a particular rigorous sense, has many divisors. Formally, a number n is colossally abundant if and only if there is an ε > 0 such that for all k > 1,

where σ denotes the sum-of-divisors function. The first few colossally abundant numbers are 2, 6, 12, 60, 120, 360, 2520, 5040, ... (sequence A004490 in OEIS); all colossally abundant numbers are also superabundant numbers, but the converse is not true.

Read more about Colossally Abundant Number:  History, Properties, Relation To The Riemann Hypothesis

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... Common name (Korean name) Species (Authority) Preferred habitat Range Status Family Muridae Murids Striped Field Mouse (등줄쥐) Apodemus agrarius (Pallas, 1771) Widespread ... Throughout, including Jeju ...
Calcium
... element with symbol Ca and atomic number 20 ... Calcium is a soft gray alkaline earth metal, and is the fifth-most-abundant element by mass in the Earth's crust ... Calcium is also the fifth-most-abundant dissolved ion in seawater by both molarity and mass, after sodium, chloride, magnesium, and sulfate ...

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