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...ass number. The atomic mass of an atom is usually within 0.1 u of the mass number. ...sotopic mass'''. In the case of chlorine, chlorine-35 has a mass of around 35 u, and chlorine-37 around 37 u. ...

...series of special numbers: 2, 1729 etc. A taxicab number is the smallest number that can be expressed as the sum of two positive cubes in ''n'' distinct wa ...n]], who was ill. Both men were mathematicians and liked to think about [[number]]s. ...

...umber)|15]] [[16 (number)|16]] [[17 (number)|17]] [[18 (number)|18]] [[19 (number)|19]]   [[twenty|20]]   ...umber)|25]] [[26 (number)|26]] [[27 (number)|27]] [[28 (number)|28]] [[29 (number)|29]]   [[thirty|30]]   ...

...of elements in a set. The cardinality of ''A''={X,Y,Z,W} is 4. We write &#35;''A''=4.<ref name=Tanton>{{cite book|title=Encyclopedia of Mathematics, Car ...same cardinality if there is a bijection between the sets. So &#35;''A''=&#35;''B'' means there is a bijection from A to B. ...

...inite]] number of elements. It is less intuitive for sets with an infinite number of elements. The example below uses two of the simplest infinite sets, that of [[natural number]]s, and that of positive [[fraction (mathematics)|fractions]]. The idea is ...

where <math>a_i</math> is the number at row <math>n</math> and position <math>i</math> in Pascal's triangle. :<math>= 16807 + 12005 \cdot 4x^2 + 3430 \cdot 16x^4 + 490 \cdot 64x^6 + 35 \cdot 256x^8 + 1 \cdot 1024x^{10}</math> ...

A '''square number''', sometimes also called a '''perfect square''', is the result of an [[int ...exponentiation]]), usually pronounced as "''n'' squared". The name square number comes from the name of the shape; see [[#Properties|below]]. ...

...them all together. The idea is that it is possible to add the [[infinite]] number of derivatives and come up with a single [[finite]] sum. ...t. He believed that it would be impossible to add an [[infinity|infinite]] number of values and get a single [[finite]] value as a result. ...

...of elements in a set. The cardinality of ''A''={X,Y,Z,W} is 4. We write &#35;''A''=4.<ref name=Tanton>{{cite book|title=Encyclopedia of Mathematics, Car ...'' is an injection. Every even number has exactly one pre-image. Every odd number has no pre-image. ...

...the positive [[divisor]]s of the number (except itself), the result is the number itself. 6 is the first perfect number. Its divisors (other than the number itself: 6) are 1, 2, and 3 and 1 + 2 + 3 equals 6. Other perfect numbers in ...

...A user of RSA creates and then publishes the product of two large [[prime number]]s, along with an auxiliary value, as their public key. The prime factors m # Choose two different large random [[prime number]]s <math>p \,</math> and <math>q \,</math> ...

A '''mathematical constant''' is a [[number]], which has a special meaning for [[wikt:calculate|calculation]]s. For exa ** R - [[Rational number]] ...

| albedo = 0.49–0.66 (varies by 35%)<ref name=Hamilton>{{cite web ...publisher=[[NewScientist]]| date = 2006| accessdate = 2006-09-08}}</ref> A number of scientists continue to hold that Pluto should be classified as a planet. ...