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  2. Perfect number - Wikipedia

    en.wikipedia.org/wiki/Perfect_number

    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. The sum of proper divisors of a number is called its aliquot sum, so a perfect number is one that is equal to its aliquot sum.

  3. Image sensor format - Wikipedia

    en.wikipedia.org/wiki/Image_sensor_format

    Although the most common medium format film, the 120 roll, is 6 cm (2.4 in) wide, and is most commonly shot square, the most common "medium-format" digital sensor sizes are approximately 48 mm × 36 mm (1.9 in × 1.4 in), which is roughly twice the size of a full-frame DSLR sensor format.

  4. 1 − 2 + 3 − 4 + ⋯ - Wikipedia

    en.wikipedia.org/wiki/1_%E2%88%92_2_%2B_3_%E2%88...

    The series' terms (1, −2, 3, −4, ...) do not approach 0; therefore 1 − 2 + 3 − 4 + ... diverges by the term test.Divergence can also be shown directly from ...

  5. Dragstrip - Wikipedia

    en.wikipedia.org/wiki/Dragstrip

    A dragstrip is a straight, purpose-built racetrack, typically an eighth, ten feet longer than three-sixteenths, or a quarter of a mile long (660/1,000/1320 feet, 201/304.8/402 m), with an additional shutdown area to allow vehicles room to stop after crossing the finish line.

  6. 11 + 2 − 6 + 24 − 120 + ⋯ - Wikipedia

    en.wikipedia.org/wiki/1_%E2%88%92_1_%2B_2_%E2%88...

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Donate; Pages for logged out editors learn more

  7. DuckDuckGo - Wikipedia

    en.wikipedia.org/wiki/DuckDuckGo

    DuckDuckGo is an American software company that offers a number of products intended to help people protect their online privacy. [5] The flagship product is a search engine that has been praised by privacy advocates.

  8. List of abbreviations used in medical prescriptions - Wikipedia

    en.wikipedia.org/wiki/List_of_abbreviations_used...

    q.1 h, q.1° quaque 1 hora: every 1 hour (can replace 1 with other numbers) q4PM at 4:00 pm (can replace 4 with other numbers) mistaken to mean every 4 hours q.a.d. quaque alternis die: every other day q.a.m. quaque die ante meridiem: every morning (every day before noon) q.d./q.1.d. quaque die: every day

  9. 9-1-1 (TV series) - Wikipedia

    en.wikipedia.org/wiki/9-1-1_(TV_series)

    9-1-1 is an American procedural drama television series created by Ryan Murphy, Brad Falchuk, and Tim Minear. The series had aired on Fox and currently airs on ABC . [ 1 ] The series follows the lives of Los Angeles first responders : police officers , paramedics , firefighters , and dispatchers .