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251 is: a Sophie Germain prime. [1] the sum of three consecutive primes (79 + 83 + 89) and seven consecutive primes (23 + 29 + 31 + 37 + 41 + 43 + 47). a Chen prime. an Eisenstein prime with no imaginary part. a de Polignac number, meaning that it is odd and cannot be formed by adding a power of two to a prime number. [2] [3]
Area code 251 is a telephone area code in the North American Numbering Plan (NANP) for southwestern Alabama, serving Mobile, Baldwin, and Washington counties and parts of six other counties. [1] It was created on June 18, 2001, as a split from area code 334 . [ 2 ]
There are known formulae to evaluate the prime-counting function (the number of primes smaller than a given value) faster than computing the primes. This has been used to compute that there are 1,925,320,391,606,803,968,923 primes (roughly 2 × 10 21 ) smaller than 10 23 .
+251 1 xxxxxx +251 11 2xxxxxx: Addis Ababa West +251 1 xxxxxx +251 11 3xxxxxx: Addis Ababa Southwest +251 1 xxxxxx +251 11 4xxxxxx: Addis Ababa South +251 1 xxxxxx +251 11 5xxxxxx: Addis Ababa Central +251 1 xxxxxx +251 11 kkkk: Addis Ababa East +251 1 251xxxx +251 11 651xxxx: WLL Addis Ababa East +251 1 252xxxx +251 11 652xxxx: WLL Addis Ababa ...
The North American Numbering Plan (NANP) divides the territories of its members into geographic numbering plan areas (NPAs). Each NPA is identified by one or more numbering plan area codes (NPA codes, or area codes), consisting of three digits that are prefixed to each local telephone number having seven digits.
Worldwide distribution of country calling codes. Regions are coloured by first digit. Country calling codes, country dial-in codes, international subscriber dialing (ISD) codes, or most commonly, telephone country codes are telephone number prefixes for reaching telephone subscribers in foreign countries or areas via international telecommunication networks.
Year 251 was a common year starting on Wednesday of the Julian calendar. At the time, in the Roman Empire, it was known as the Year of the Consulship of Traianus and Etruscus (or, less frequently, year 1004 Ab urbe condita ).
A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.