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  2. Divisibility rule - Wikipedia

    en.wikipedia.org/wiki/Divisibility_rule

    The remainder of the sum when divided by 7 is the remainder of the given number when divided by 7. For example: The number 194,536 leaves a remainder of 6 on dividing by 7. The number 510,517,813 leaves a remainder of 1 on dividing by 7. Proof of correctness of the method

  3. Table of divisors - Wikipedia

    en.wikipedia.org/wiki/Table_of_divisors

    13 4 deficient, composite 10: 1, 2, 5, 10 4 18 8 deficient, highly abundant, composite 11: ... 280 172 abundant, highly abundant, composite 109: 1, 109 2 110 1

  4. 280 - Wikipedia

    en.wikipedia.org/wiki/280

    Year 280 was a leap year starting on Thursday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Messalla and Gratus (or, less frequently, year 1033 Ab urbe condita ).

  5. Division (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Division_(mathematics)

    In terms of partition, 20 / 5 means the size of each of 5 parts into which a set of size 20 is divided. For example, 20 apples divide into five groups of four apples, meaning that "twenty divided by five is equal to four". This is denoted as 20 / 5 = 4, or ⁠ 20 / 5 ⁠ = 4. [2] In the example, 20 is the dividend, 5 is the divisor, and 4 is ...

  6. Amicable numbers - Wikipedia

    en.wikipedia.org/wiki/Amicable_numbers

    Amicable numbers (220, 284) are referenced in episode 13 of the 2017 Korean drama Andante. Amicable numbers are featured in the Greek movie The Other Me (2016 film). Amicable numbers are discussed in the book Are Numbers Real? by Brian Clegg. Amicable numbers are mentioned in the 2020 novel Apeirogon by Colum McCann.

  7. ER season 13 - Wikipedia

    en.wikipedia.org/wiki/ER_season_13

    280: 13 "A House Divided" Andrew Bernstein: R. Scott Gemmill: January 11, 2007 () 2T7813: 12.18 [14] Dr. Pratt differs with Rev. Watkins over the church clinic and ...

  8. 7 Tips for Having More Energy - AOL

    www.aol.com/lifestyle/7-tips-having-more-energy...

    How to Have More Energy: 7 Tips. This article was reviewed by Craig Primack, MD, FACP, FAAP, FOMA. Life can get incredibly busy, and keeping up often hinges on having enough energy.

  9. Harshad number - Wikipedia

    en.wikipedia.org/wiki/Harshad_number

    The number 18 is a harshad number in base 10, because the sum of the digits 1 and 8 is 9, and 18 is divisible by 9.; The Hardy–Ramanujan number (1729) is a harshad number in base 10, since it is divisible by 19, the sum of its digits (1729 = 19 × 91).