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  2. List of Billboard Rhythmic number-one songs of the 2020s

    en.wikipedia.org/wiki/List_of_Billboard_Rhythmic...

    number one Song Artist(s) Weeks at number one 2020 [1] [2] [failed verification] December 28, 2019 "Leave Em Alone" Layton Greene, Lil Baby, City Girls & PnB Rock: 3 January 18 "Ballin'"↓↑ Mustard featuring Roddy Ricch: 2 January 25 "Roxanne"↓↑ Arizona Zervas: 3 February 8 "Heartless" The Weeknd: 1 February 22 "The Box" ↓↑ Roddy ...

  3. Category:All articles with failed verification - Wikipedia

    en.wikipedia.org/wiki/Category:All_articles_with...

    Pages in category "All articles with failed verification" The following 200 pages are in this category, out of approximately 14,298 total. This list may not reflect recent changes .

  4. Telephone keypad - Wikipedia

    en.wikipedia.org/wiki/Telephone_keypad

    A mobile phone keypad with Latin and Japanese characters. In the course of telephone history, dials as well as keypads have been associated with various mappings of letters and characters to numbers. The system used in Denmark [failed verification] was different from that used in the UK, which, in turn, was different from the US and Australia. [9]

  5. Wikipedia:Contact us - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:Contact_us

    If you have questions about the concept of Wikipedia rather than a specific problem, the About Wikipedia page may help. If you want to ask other users for help with editing or using Wikipedia, stop by the Teahouse , Wikipedia's live help channel , or the help desk to ask someone for assistance.

  6. Luhn algorithm - Wikipedia

    en.wikipedia.org/wiki/Luhn_algorithm

    The Luhn algorithm or Luhn formula, also known as the "modulus 10" or "mod 10" algorithm, named after its creator, IBM scientist Hans Peter Luhn, is a simple check digit formula used to validate a variety of identification numbers.

  7. Facial recognition system - Wikipedia

    en.wikipedia.org/wiki/Facial_recognition_system

    Facial recognition software at a US airport Automatic ticket gate with face recognition system in Osaka Metro Morinomiya Station. A facial recognition system [1] is a technology potentially capable of matching a human face from a digital image or a video frame against a database of faces.

  8. Check digit - Wikipedia

    en.wikipedia.org/wiki/Check_digit

    The final digit of a Universal Product Code, International Article Number, Global Location Number or Global Trade Item Number is a check digit computed as follows: [3] [4]. Add the digits in the odd-numbered positions from the left (first, third, fifth, etc.—not including the check digit) together and multiply by three.

  9. Multi-factor authentication - Wikipedia

    en.wikipedia.org/wiki/Multi-factor_authentication

    Account recovery typically bypasses mobile-phone two-factor authentication. [2] [failed verification] Modern smartphones are used both for receiving email and SMS. So if the phone is lost or stolen and is not protected by a password or biometric, all accounts for which the email is the key can be hacked as the phone can receive the second factor.