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| {{Infobox number
| | My name is Hershel from Vitriola doing my final year engineering in Computing and Information Science. I did my schooling, secured 78% and hope to find someone with same interests in Meteorology.<br><br>Feel free to surf to my page: how to get free fifa 15 coins ([http://Www.Radiojuliaca.Com.pe/index.php/el-collao/item/77-puno-centro-cultural-melodias-de-ilave-cu please click the following post]) |
| | number = 121
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| | divisor = 1, 11, 121
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| }}
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| '''121''' ('''one hundred [and] twenty-one''') is the [[natural number]] following [[120 (number)|120]] and preceding [[122 (number)|122]].
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| ==In mathematics==
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| '''One hundred [and] twenty-one''' is a [[Square (algebra)|square]] and is the sum of three consecutive [[prime number|prime]]s (37 + 41 + 43). There are no squares besides 121 known to be of the form <math>1 + p + p^2 + p^3 + p^4</math>, where ''p'' is prime (3, in this case). Other such squares must have at least 35 digits.
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| There are only two other squares known to be of the form n! + 1, supporting [[Brocard's conjecture]]. Another example of 121 being of the few examples supporting a conjecture is that Fermat conjectured that 4 and 121 are the only perfect squares of the form ''x''<sup>3</sup> - 4 (with ''x'' being 2 and 5, respectively).<ref>Wells, D., ''[[The Penguin Dictionary of Curious and Interesting Numbers]]'', London: Penguin Group. (1987): 136</ref>
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| It is also a [[star number]] and a [[centered octagonal number]].
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| [[File:Chinese checkers start positions.svg|thumb|left|A [[Chinese checkers]] board has 121 holes]]
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| In base 10, it is a [[Smith number]] since its digits add up to the same value as its factorization (which uses the same digits) and as a consequence of that it is a [[Friedman number]] (11^2). But it can not be expressed as the sum of any other number plus that number's digits, making 121 a [[self number]].
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| ==In other fields==
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| 121 is also:
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| * The [[electricity]] [[emergency telephone number]] in [[Egypt]]
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| * The number for [[voicemail]] for [[mobile phone]]s on the [[Vodafone]] network<ref>Vodafone, [http://www.vodafone.co.uk/business/mobile-phones/calling-and-messaging/ Calling and messaging]</ref>
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| * The undiscovered [[chemical element]] [[Unbiunium]] has the atomic number 121
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| * The official end score for [[Cribbage]]<ref>[http://www.cribbage.org/rules/rule1.asp#section1 Rule 1.1], [[American Cribbage Congress]], retrieved 6 September 2011</ref>
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| ==See also==
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| * [[List of highways numbered 121]]
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| * [[United States House of Representatives House Resolution 121]]
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| * [[United Nations Security Council Resolution 121]]
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| ==References==
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| <references/>
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| {{Integers|1}}
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| {{DEFAULTSORT:121 (Number)}}
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| [[Category:Integers]]
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My name is Hershel from Vitriola doing my final year engineering in Computing and Information Science. I did my schooling, secured 78% and hope to find someone with same interests in Meteorology.
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