245 (number)

From Wikipedia, the free encyclopedia
← 244 245 246 →
List of numbers — Integers
← 0 100 200 300 400 500 600 700 800 900 →
Cardinaltwo hundred forty-five
Ordinal245th
(two hundred forty-fifth)
Factorization5 × 72
Greek numeralΣΜΕ´
Roman numeralCCXLV
Binary111101012
Ternary1000023
Octal3658
Duodecimal18512
HexadecimalF516

245 (two hundred [and] forty-five) is the natural number following 244 and preceding 246.

In mathematics[]

245 is:

  • a composite number.[1][2]
  • palindromic in bases 34 (7734), 48 (5548), 244 (11244)[3]
  • a Harshad number in bases 7, 9, 11, 15, 31, 35, 36 (and 14 other bases).[4]
  • the aliquot sum of any of these numbers: 723, 1195, 2563, 3859,[5] 9259, 10123, 12283, 14659 and 14803[citation needed]
  • part of the 97-aliquot tree.[5] The aliquot sequence starting at 10222 is: 10222, 5978,[citation needed] 4624, 4893, 2595, 1581, 723, 245[5], 97, 1, 0[citation needed]

In online public access (library) catalogs[]

In the MARC format for records in online public access (library) catalogs, in which each type of information about a book (or other library material) is identified with a 3-digit number, 245 identifies the title of the item;[6] most library catalog software requires that each record have at least a 245 tag, even if no other information is entered about the item.[citation needed]

In other fields[]

  • The number of Jewish singers who returned from captivity in Babylon in c. 538 BCE following the rise of Cyrus the Great and the Persian Empire. ...besides their male and female slaves, of whom there were seven thousand three hundred thirty-seven; and they had two hundred forty-five singers, male and female. They had seven hundred thirty-six horses, two hundred forty-five mules, four hundred thirty-five camels, and six thousand seven hundred twenty donkeys. (see Nehemiah 7:67–7:69—Also, an almost identical reference in Ezra 2:65–2:67 states that there were only 200 singers, and that the slaves were "servants").
  • 245T or 2,4,5-T is a common abbreviation for the widely used herbicide 2,4,5-Trichlorophenoxyacetic acid.[7][8][9][verification needed]
  • "245" is the name of a jazz instrumental by Eric Dolphy, featured on his 1960 album Outward Bound.[10]
  • 245 is the international country calling code for Guinea-Bissau.[11]

References[]

  1. ^ "[Solved] Is 245 a composite number?". www.mathwarehouse.com. Archived from the original on 1 April 2014. Retrieved 2 August 2021.
  2. ^ "Is 245 a Prime Number | Is 245 a Prime or Composite Number?". Cuemath. Retrieved 2021-09-13.
  3. ^ "Double Base Palindrome". GeeksforGeeks. 2017-11-01. Retrieved 2021-09-13.
  4. ^ "Harshad (Or Niven) Number". GeeksforGeeks. 2016-11-19. Retrieved 2021-09-13.
  5. ^ Jump up to: a b c Mathar, Richard J. (21 March 2014). "Illustration of Aliquot Sequence Mergers" (PDF). www2.mpia-hd.mpg.de. Archived (PDF) from the original on 2 August 2021. Retrieved 2 August 2021.
  6. ^ "MARC 21 Format for Bibliographic Data: 245: Title Statement (Network Development and MARC Standards Office, Library of Congress)". www.loc.gov. Retrieved 2021-08-02.
  7. ^ "CDC - NIOSH Pocket Guide to Chemical Hazards - 2,4,5-T". www.cdc.gov. Retrieved 2021-08-02.
  8. ^ "2,4,5-Trichlorophenoxyacetic Acid - an overview | ScienceDirect Topics". www.sciencedirect.com. Retrieved 2021-08-02.
  9. ^ "Glossary". www.chm.bris.ac.uk. Retrieved 2021-08-02.
  10. ^ Barnes, Tom (29 May 2015). "The Story of How Brooklyn Became a Music Mecca Way Before Hipsters". Mic. Archived from the original on 28 April 2016. Retrieved 2 August 2021.
  11. ^ "T020200005C0003PDFE.pdf" (PDF). www.itu.int. Retrieved 2 August 2021.
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