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Rating:The UK telephone numbering plan, also known as the National Telephone Numbering Plan, is the system used for assigning telephone numbers in the United Kingdom and the Crown Dependencies. It is regulated by the UK government's Office of Communications, which holds responsibility for telecommunications. Since 28 April 2001, almost all geographic numbers and most non-geographic numbers have 9 or 10 national numbers after the "0" trunk code. All mobile telephone numbers have 10 national numbers after the "0" trunk code.
read moreA telephone number or phone number is a sequence of digits used to call from one telephone line to another in a public switched telephone network. When telephone numbers were invented, they were short as few as one, two or three digits and were given orally to a switchboard operator. As phone systems have grown and interconnected to encompass the world, telephone numbers have become longer.
read moreIn mathematics, the telephone numbers or involution numbers are a sequence of integers that count the number of ways that ''n'' subscribers to a telephone system can be linked in pairs, the number of matchings of a complete graph on ''n'' vertices, the maximum value of the Hosoya index of a molecule with ''n'' atoms, the number of self-inverse permutations on ''n'' elements, the sum of absolute values of coefficients of the Hermite polynomials, the number of Young tableaux with ''n'' cells, and the sum of the degrees of the irreducible representations of the symmetric group. They were first studied in 1800 by Heinrich August Rothe, who gave a recurrence equation by which they may be calculated, giving the values :1, 1, 2, 4, 10, 26, 76, 232, 764, 2620, 9496,.... John Riordan provides the following explanation for these numbers: suppose that a telephone service has ''n'' subscribers, any two of whom may be connected to each other by a telephone call.
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