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111 is a free-to-call single non-emergency number medical helpline operating in England, Scotland and Wales. The 111 phone service has replaced the various non-geographic 0845 rate numbers and is part of each country's National Health Service: in England the service is known as NHS 111; [1] in Scotland, NHS 24; [2] and in Wales, NHS 111 Wales.
The 0800 range can have NSN length as 10, 9, or 7 digits. The 0845 range can have NSN length as 10 or 7 digits. The 0500 range had NSN length as 9 digits only, and was withdrawn from use on 3 June 2017. All other UK numbers have NSN length of 10 digits. There are no telephone numbers in the UK with an NSN length of 8 digits.
This is a list of articles about prime numbers. A prime number (or prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself. By Euclid's theorem, there are an infinite number of prime numbers. Subsets of the prime numbers may be generated with various formulas for primes.
0800 was Tongue (TO0) – numbers were transferred to 0847 (ELNS) [notes 14] 0800 later used for BT Freefone numbers - usage of BT 9-digit 0800 numbers continued after the Big Number Change; all new 0800 allocations have 10 digits and multiple operators now issue 0800 numbers. 01801 — unused
The remainder when dividing this number by 11 is calculated, yielding a number in the range 0–10, which would be 2 in this case. Finally, this number is subtracted from 11 to give the checksum in the range 1–11, in this case 9, which becomes the last digit of the NHS number. A checksum of 11 is represented by 0 in the final NHS number.
Rowland (2008) proved that this sequence contains only ones and prime numbers. However, it does not contain all the prime numbers, since the terms gcd(n + 1, a n) are always odd and so never equal to 2. 587 is the smallest prime (other than 2) not appearing in the first 10,000 outcomes that are different from 1. Nevertheless, in the same paper ...
A non-geographic number is a type of telephone number that is not linked to any specific locality. Such numbers are an alternative to the traditional 'landline' numbers that are assigned geographically using a system of location-specific area codes. Non-geographic numbers are used for various reasons, from providing flexible routing of incoming ...
Mersenne primes and perfect numbers are two deeply interlinked types of natural numbers in number theory. Mersenne primes, named after the friar Marin Mersenne, are prime numbers that can be expressed as 2 p − 1 for some positive integer p. For example, 3 is a Mersenne prime as it is a prime number and is expressible as 2 2 − 1.