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81 number - In mathematics | | 81 number - In mathematics: Encyclopedia II - 81 number - In mathematics | | Eighty-one is the square of 9. It is a heptagonal number and a centered octagonal number. It is also a tribonacci number, an open meandric number and a Harshad number.
81 is also one of three numbers (the other two are 1458 and 1729) which, when its digits are added together, produces a sum which, when multiplied by its reversed self, yields the original number:
1 + 8 = 9
9 · 9 = 81
(although this case is somewhat dege ...
See also:81 number, 81 number - In mathematics, 81 number - In astronomy, 81 number - In other fields | | | 81 number, 81 number - In astronomy, 81 number - In mathematics, 81 number - In other fields | | |
| | | 81 number: Encyclopedia II - 81 number - In mathematics
81 number - In mathematics
Eighty-one is the square of 9. It is a heptagonal number and a centered octagonal number. It is also a tribonacci number, an open meandric number and a Harshad number.
81 is also one of three numbers (the other two are 1458 and 1729) which, when its digits are added together, produces a sum which, when multiplied by its reversed self, yields the original number:
1 + 8 = 9
9 · 9 = 81
(although this case is somewhat degenerate, as the sum has only a single digit).
Other related archives>>, <<, 0, 10, 1296, 1458, 1729, 1981, 20, 30, 40, 50, 60, 70, 80, 81, 81 BC, 82, 83, 84, 85, 86, 87, 88, 89, 9, 90, 958, Andromeda, April 19, Baby 81, Bode's Galaxy, Department, February 19, French department, Harshad number, ISBN, India, Integers, Interstate 81, Japan, June 19, Kobe Bryant, List of numbers, Lizzie Borden, M81, M81 Group, May 12, Messier object, NFL, New General Catalogue, New York, Saros, Sinclair ZX81, Tao te Ching, Tarn, Tennessee, Terrell Owens, Unterseeboot 81, Ursa Major, atomic number, centered octagonal number, code for international direct dial, constellation, heptagonal number, lunar eclipse, magnitude, natural number, open meandric number, short film, solar eclipse, spiral galaxy, square, thallium, tribonacci number
 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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