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ⓘ 105 (number)




105 (number)
                                     

ⓘ 105 (number)

105 is a triangular number, a dodecagonal number and the first Zeisel number. It is a sphenic number, and is the product of three consecutive prime numbers. 105 is the double factorial of 7. It is also the sum of the first five square pyramidal numbers.

105 comes in the middle of the prime quadruplet 101, 103, 107, 109. The only other such odd numbers less than a thousand are 9, 15, 195 and 825. 105 is also a pseudoprime to the prime bases 13, 29, 41, 43, 71, 83 and 97. The distinct prime factors of 105 add up to 15, and so do those of 104, hence the two numbers form a Ruth-Aaron pair under the first definition.

105 is also a number n for which n − 2 k {\displaystyle n-2^{k}} is prime, for 0 < k < l o g 2 n {\displaystyle 0

                                     
  • Route 105 is a state road in southeastern Massachusetts, running from Marion to Halifax in a generally north - south direction. Route 105 begins at U.S
  • USS Pioneer AM - 105 was an Auk - class minesweeper acquired by the United States Navy for the dangerous task of removing mines from minefields laid in
  • Canada CF - 105 Arrow, often known simply as the Avro Arrow, was a delta - winged interceptor aircraft designed and built by Avro Canada. The CF - 105 held the
  • Highway 105 AR 105 Ark. 105 and Hwy. 105 is a north south state highway in Pope County, Arkansas. The route of 24.90 miles 40.07 km runs from Galla
  • this number State Highway 105 was authorized on April 22, 1933. The route was paved by 1940. From 1934 to 1980, the northern terminus of Highway 105 was
  • Squadron 105 th Force Support Squadron 105 th Logistics Readiness Squadron 105 th Base Defense Squadron 105 th Communications Flight 105 th Medical Group 105 th Comptroller
  • In recreational mathematics, a ban number is a number that does not contain a particular letter when spelled out in English in other words, the letter
  • F - 105 Survivors lists all known surviving Republic F - 105 Thunderchief complete airframes in the world as of May 2008 along with their serial number

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