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Home > Art, Film & Photography > Perfect Numbers: Perfect Number, Mersenne Prime, 6, 28, List of Perfect Numbers, 496
Perfect Numbers: Perfect Number, Mersenne Prime, 6, 28, List of Perfect Numbers, 496

Perfect Numbers: Perfect Number, Mersenne Prime, 6, 28, List of Perfect Numbers, 496


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About the Book

Purchase includes free access to book updates online and a free trial membership in the publisher's book club where you can select from more than a million books without charge. Chapters: Perfect Number, Mersenne Prime, 6, 28, List of Perfect Numbers, 496, 8128. Excerpt: 27 29 28 28 ( twenty-eight ) is the natural number following 27 and preceding 29. In mathematics It is a composite number, its proper divisors being 1, 2, 4, 7, and 14. Twenty-eight is the second perfect number . As a perfect number, it is related to the Mersenne prime 7, since 2 (2 - 1) = 28. The next perfect number is 496, the previous being 6 . Twenty-eight is the sum of the totient function for the first nine integers. Twenty-eight is not the aliquot sum of any number other than itself and is therefore not a component in an aliquot sequence . Since the greatest prime factor of 28 + 1 = 785 is 157, which is more than 28 twice, 28 is a Strmer number . Twenty-eight is a harmonic divisor number, a happy number, a triangular number, a hexagonal number, and a centered nonagonal number . It appears in the Padovan sequence, preceded by the terms 12, 16, 21 (it is the sum of the first two of these). It is also a Keith number, because it recurs in a Fibonacci -like sequence started from its base 10 digits: 2, 8, 10, 18, 28... Twenty-eight is the third positive integer with a prime factorization of the form 2 q where q is an odd prime . Twenty-eight is the ninth and last number in early Indian magic square of order 3. There are twenty-eight convex uniform honeycombs . Twenty-eight is the only positive integer that has a unique Kayles nim-value . In science Astronomy In other fields Twenty-eight is: item An abbreviation for such years as 1928 and 2028. item In Gematriya, the system of Hebrew Numerolo...


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Product Details
  • ISBN-13: 9781155245683
  • Publisher: Books LLC
  • Publisher Imprint: Books LLC
  • Height: 152 mm
  • No of Pages: 52
  • Spine Width: 3 mm
  • Weight: 91 gr
  • ISBN-10: 1155245687
  • Publisher Date: 02 May 2010
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Sub Title: Perfect Number, Mersenne Prime, 6, 28, List of Perfect Numbers, 496
  • Width: 229 mm


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