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  2. Senary - Wikipedia

    en.wikipedia.org/wiki/Senary

    Additionally, since the smallest four primes (2, 3, 5, 7) are either divisors or neighbors of 6, senary has simple divisibility tests for many numbers. Furthermore, all even perfect numbers besides 6 have 44 as the final two digits when expressed in senary, which is proven by the fact that every even perfect number is of the form 2 p – 1 (2 p ...

  3. List of mobile telephone prefixes by country - Wikipedia

    en.wikipedia.org/wiki/List_of_mobile_telephone...

    6 to 8 digits 22: 9: 2degrees: 7 digits 24? Unused: Protected by Management Committee on 30 January 2009 to preserve the potential code expansion option. 25: 8-9: Unused: 6-7 digits - Was used by Telecom New Zealand (now called Spark) until it was shut down on 31 March 2007. All numbers have now migrated to 027 (7-digit) and 0274 (6-digit).

  4. List of country calling codes - Wikipedia

    en.wikipedia.org/wiki/List_of_country_calling_codes

    Zone 6 uses seven 2-digit codes (60–66) and three sets of 3-digit codes (67x–69x) to serve Southeast Asia and Oceania. Zone 7 uses an integrated numbering plan; two digits (7x) determine the area served: Russia or Kazakhstan .

  5. What's a six-digit verification code — and why you should ...

    www.aol.com/whats-six-digit-verification-code...

    Never give a verification code to a stranger. No one should ever ask you for a six-digit verification code — not a stranger on social media, not tech support, not even your bank.

  6. List of numeral systems - Wikipedia

    en.wikipedia.org/wiki/List_of_numeral_systems

    Such method is 6.7% more efficient than MIME-64 which encodes a 24 bit number into 4 printable characters. 89: Largest base for which all left-truncatable primes are known. 90: Nonagesimal: Related to Goormaghtigh conjecture for the generalized repunit numbers (111 in base 90 = 1111111111111 in base 2). 95: Number of printable ASCII characters ...

  7. 1001 (number) - Wikipedia

    en.wikipedia.org/wiki/1001_(number)

    Two properties of 1001 are the basis of a divisibility test for 7, 11 and 13. The method is along the same lines as the divisibility rule for 11 using the property 10 ≡ -1 (mod 11). The two properties of 1001 are 1001 = 7 × 11 × 13 in prime factors 10 3 ≡ -1 (mod 1001) The method simultaneously tests for divisibility by any of the factors ...

  8. International Article Number - Wikipedia

    en.wikipedia.org/wiki/International_Article_Number

    It is a subset of EAN. Use of the JAN standard began in 1978. Originally, JAN was issued a flag code (EAN's number system) of 49. In 1992, JAN was newly issued an additional flag code of 45. In January 2001 the manufacturer code changed to 7 digits (9 digits including the flag code) for new companies. [9]

  9. AOL Mail

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!