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  2. Telephone numbers in Vietnam - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_Vietnam

    Mobile telephone numbers. [1] [2] In Vietnam, mobile phone numbers follow the format 09x-xxxxxxx or new prefixes: 03x, 05x, 07x, 08x. The first 0 is the trunk code. The next 2 digits ( 3x, 5x, 7x, 8x or 9y) specify the mobile phone operator. Some mobile phone operators have been given more than one operator code. In Circular No. 22/2014/TT ...

  3. Telephone numbers in Cameroon - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_Cameroon

    1 June 2007 - national renumbering to 8 digits, when 7-digit numbers were expanded to eight digits. September 2004 - new mobile number ranges assigned. 26 October 2001 - national renumbering to 7-digit plan Cameroon's previous 6-digit national numbers were changed to 7 digits on 26 October 2001.

  4. List of prime numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_prime_numbers

    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 )

  5. Telephone numbers in Algeria - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_Algeria

    Fixed-line (landline) numbers. Calls within an area code (The area code is a 2 digits number, i.e. 21, 41, 46 0 THE-AREA-CODE xx xx xx. C; Calls from outside Algeria ("yy" is the area code) +213 yy xx xx xx. Mobile numbers. Calls from Algeria ("y" is the operator code, 5 for Ooredoo, 6 for Mobilis, 7 for Djezzy) 0yxx xx xx xx

  6. Toll-free telephone numbers in the North American Numbering ...

    en.wikipedia.org/wiki/Toll-free_telephone...

    Toll-free telephone numbers in the North American Numbering Plan. 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. 811 is excluded because it is a special dialing ...

  7. Annuities in the United States - Wikipedia

    en.wikipedia.org/wiki/Annuities_in_the_United_States

    In the United States, an annuity is a financial product which offers tax-deferred growth and which usually offers benefits such as an income for life. Typically these are offered as structured ( insurance) products that each state approves and regulates in which case they are designed using a mortality table and mainly guaranteed by a life insurer.

  8. National conventions for writing telephone numbers - Wikipedia

    en.wikipedia.org/wiki/National_conventions_for...

    Service numbers (area codes 800, 900, 906 and 909) have either 4 or 7 remaining digits, making them 8 or 11 digits in total: 0AAA-BBBB or 0AAA-BBBBBBB. The area code 14 has no trunk prefix and is used for government numbers, currently only for municipalities. The remaining digits represent the area code of the municipality.

  9. Number - Wikipedia

    en.wikipedia.org/wiki/Number

    Similarly, a decimal numeral with an unlimited number of 0's can be rewritten by dropping the 0's to the right of the rightmost nonzero digit, and a decimal numeral with an unlimited number of 9's can be rewritten by increasing by one the rightmost digit less than 9, and changing all the 9's to the right of that digit to 0's.