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Perfect number. In number theory, a perfect number is a positive integer that is equal to the sum of its positive proper divisors, that is, divisors excluding the number itself. For instance, 6 has proper divisors 1, 2 and 3, and 1 + 2 + 3 = 6, so 6 is a perfect number. The next perfect number is 28, since 1 + 2 + 4 + 7 + 14 = 28.
Telephone number pooling, thousands-block number pooling, or just number pooling, is a method of allocating telephony numbering space of the North American Numbering Plan in the United States. The method allocates telephone numbers in blocks of 1,000 consecutive numbers of a given central office code to telephony service providers.
HSBC InvestDirect is the retail electronic trading platform by HSBC Securities, for DIY Investors. HSBC InvestDirect is intended for those who understand the loss of capital investment risks involved in trading in the capital markets , since no portfolio management advice is provided as part of the service.
The use of # as an abbreviation for "number" is common in informal writing, but use in print is rare. [44] Where Americans might write "Symphony #5", British and Irish people usually write "Symphony No. 5". [citation needed] When # is after a number, it is read as "pound" or "pounds", meaning the unit of weight.
Website. hsbc .co .uk. HSBC UK Bank plc is a British multinational banking and financial services organisation based in Birmingham, England. It is a wholly owned subsidiary of the global HSBC banking and financial group, which has been headquartered in London since 1993. The UK headquarters of HSBC is located at One Centenary Square in Birmingham.
Weakly prime numbers. Primes that having any one of their (base 10) digits changed to any other value will always result in a composite number. 294001, 505447, 584141, 604171, 971767, 1062599, 1282529, 1524181, 2017963, 2474431, 2690201, 3085553, 3326489, 4393139 ( OEIS : A050249 )
The song was in 11th place among the best Brazilian songs of 1997. Since the release of the song, several owners of the number 234-5678, mentioned in the chorus of the song, have frequently received several prank calls. The label Sony Music has offered to buy the phone lines for the number.
South Africa switched to a closed numbering system effective 16 January 2007. At that time, it became mandatory to dial the full 10-digit telephone number, including the zero in the three-digit area code, for local calls (e.g., 011 must be dialed from within Johannesburg).