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75 number - In mathematics | | 75 number - In mathematics: Encyclopedia II - 75 number - In mathematics | | As the sum of the first five pentagonal numbers, seventy-five is a pentagonal pyramidal number. It is also an enneagonal number.
It is also a Keith number, because it recurs in a Fibonacci-like sequence started from its base 10 digits: 7, 5, 12, 17, 29, 46, 75... But there is no integer that added up to its own digits adds up to 75, hence 75 is a self number.
There are 75 uniform polyhedra.
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See also:75 number, 75 number - In mathematics, 75 number - In science, 75 number - In other fields | | | 75 number, 75 number - In mathematics, 75 number - In other fields, 75 number - In science | | |
| | | 75 number: Encyclopedia II - 75 number - In mathematics
75 number - In mathematics
As the sum of the first five pentagonal numbers, seventy-five is a pentagonal pyramidal number. It is also an enneagonal number.
It is also a Keith number, because it recurs in a Fibonacci-like sequence started from its base 10 digits: 7, 5, 12, 17, 29, 46, 75... But there is no integer that added up to its own digits adds up to 75, hence 75 is a self number.
There are 75 uniform polyhedra.
Other related archives>>, <<, 0, 10, 1014, 1975, 20, 30, 40, 50, 60, 694, 70, 71, 72, 73, 74, 75, 75 BC, 76, 77, 78, 79, 80, 90, August 26, Florida, Harry S. Truman, Ian Lygo, Integers, Interstate 75, July 7, June 15, Keith number, Ken Jennings, List of numbers, M75, May 8, Messier object, Michigan, New General Catalogue, Pisces, Sagittarius, Saros, USS Harry S. Truman (CVN-75), United States, astronomy, atomic number, constellation, enneagonal number, globular cluster, lunar eclipse, magnitude, natural number, pentagonal numbers, pentagonal pyramidal number, polyhedra, rhenium, self number, solar eclipse, speed limit, spiral galaxy
 Adapted from the Wikipedia article "In mathematics", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki |
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