Leap year and Prime number: Difference between pages

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Leap years are years which contain 366 days, compared with common years which have 365 days.  
''Maths - encryption''.


The extra day in a leap year is February 29.  
A prime number is a positive whole number that is divisible only by itself and 1.


Some encryption systems make use of very large prime numbers, for example RSA encryption.


Years divisible by 4 are normally leap years, with some exceptions.


All of the years divisible by 4, between 1904 and 2096 inclusive, were or will be leap years.  
Examples of small prime numbers include 2, 3, 5, 7 and 11.




1900 was not a leap year.
== See also ==
* [[Encryption]]
* [[Factors]]
* [[RSA encryption]]


2100, 2200 and 2300 will not be leap years.
[[Category:The_business_context]]
 
[[Category:Manage_risks]]
 
[[Category:Technology]]
The rules for determining leap years are:
 
* If the year is divisible by 4, it will normally be a leap year.  For example, 2016, 2020 and 2024.
* If it is divisible by 100, it will not normally be a leap year. For example, 2100 and 2200.
* An exception to the exception are years divisible by 400. For this reason, 2000 was a leap year, and 2400 will be one too.
 
 
The reason for the rules is to approximate the true number of astronomical days in a year, which is 365.24.
 
 
==See also==
[[Effective annual rate]]

Revision as of 15:54, 18 December 2019

Maths - encryption.

A prime number is a positive whole number that is divisible only by itself and 1.

Some encryption systems make use of very large prime numbers, for example RSA encryption.


Examples of small prime numbers include 2, 3, 5, 7 and 11.


See also