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Telephone numbers in Oman have a country calling code of +968 and an 8-digit National Significant Number (NSN). [ 1 ] Major telecom operators are Omantel , Ooredoo , Awasr , Vodafone .
[7] [8] [9] It is also not known if any odd perfect numbers exist; various conditions on possible odd perfect numbers have been proven, including a lower bound of 10 1500. [10] The following is a list of all currently known Mersenne primes and perfect numbers, along with their corresponding exponents p.
Until 1969, a system was used with 2-digit area codes and local numbers varying from 2 to 5 digits depending on the area. Around 1969/1970 this was changed to a closed numbering system with 5-digit numbers nationwide; a zero had to be dialled before the number.
Mobile numbers share the same geographic area codes as landlines, but the first digit differentiates them. Landline numbers start with digits 2 through 5. Initial digits 6 through 9 are reserved for mobile numbers, but as of 2017 all mobile numbers in Brazil start with the digit 9.
Originally, a product was and is still the result of the multiplication of two or more numbers.For example, 15 is the product of 3 and 5.The fundamental theorem of arithmetic states that every composite number is a product of prime numbers, that is unique up to the order of the factors.
51xxxxxx to 57xxxxxx – Mobile phone number; 58xxxxxx – 'Class 2 Service' such as voice over IP; 59xxxxxx – Mobile phone number; 6xxxxxxx – Mobile phone number; 7xxxxxxx – Mobile phone number & pager number; 800xxxxxx – Toll-free telephone number; 81xxxxxx to 83xxxxxx – Personal number service; 84xxxxxx to 87xxxxxx – Mobile phone ...
New numbers are assigned in smaller blocks of 10,000, 100,000 or 1,000,000 numbers, as opposed to the previous practice of assigning a whole prefix to an operator, which is a block of nearly 8,000,000 numbers. The advent of mobile number portability means the current operator of a particular mobile phone number is not necessarily the original ...
911, sometimes written 9-1-1, is the national emergency telephone number of the Philippines managed by the Emergency 911 National Office. On August 1, 2016, 911 and 8888 , a public complaint hotline, effectively replaced Patrol 117.