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Toll-free telephone numbers in the North American Numbering Plan have the area code prefix 800, 833, 844, 855, 866, 877, and 888.Additionally, area codes 822, 880 through 887, and 889 are reserved for toll-free use in the future.
The ratio of the Grashof number to the square of the Reynolds number may be used to determine if forced or free convection may be neglected for a system, or if there's a combination of the two. This characteristic ratio is known as the Richardson number (Ri). If the ratio is much less than one, then free convection may be ignored.
Paging services 64 x 000 64 x xxx xxx Carrier Selection Code 10xx 10xxx UTR VSAT, Tekstofon, Fixed SMS 802 xxx xxx UAN (universal number) 804 xxx xxx VPN 806 xxx xxx VCC 808 xxx xxx VoIP 39x xxx xxx NDSI – dialed access to data networks incl. Internet 20 xx xx
This page details the format and usage of telephone numbers in Slovakia. Today, Slovakia uses a closed numbering plan with area codes beginning with 0. After 0, there is usually a 2-digit prefix, followed by a 7-digit subscriber number. The capital, Bratislava, has one-digit prefix and an 8-digit subscriber number.
All landline subscriber numbers follow the pattern: 60B-YXX-XXXX; Where B is the dialing zone (where the number is located), Y is 2 to 8 (or 9 for pay phones), [2] [failed verification] and X is any digit.
An immediate result of this definition is that all prime numbers are square-free. A positive integer is square-free if and only if all abelian groups of order are isomorphic, which is the case if and only if any such group is cyclic. This follows from the classification of finitely generated abelian groups.
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