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Tuesday, January 23, 2007

SPECIALITY OF NUMBERS

0 is the additive identity

1 is the multiplicative identity

2 is the only even prime

3 is the number of spatial dimensions we live in.

5 is the number of Platonic solids. (The Platonic solids, also called the regular solids or regular polyhedra, are convex polyhedra with equivalent faces composed of congruent convex regular polygons. There are exactly five such solids : the cube, dodecahedron, icosahedron, octahedron, and tetrahedron, as was proved by Euclid in the last proposition of the Elements. The Platonic solids are sometimes also called "cosmic figures")

6 is the smallest perfect number.

7 is the smallest number of faces of a regular polygon that is not constructible by straightedge and compass.

8 is the largest cube in the Fibonacci sequence.

10 is the base of our number system.

11 is the largest known multiplicative persistence. (Multiply all the digits of a number by each other, repeating with the product until a single digit is obtained. The number of steps required is known as the multiplicative persistence, and the final digit obtained is called the multiplicative digital root of .
For example, the sequence obtained from the starting number 9876 is (9876, 3024, 0), so 9876 has an multiplicative persistence of two and a multiplicative digital root of 0.)


16 is the only number of the form x^y = y^x with x and y different integers

18 is the only number that is twice the sum of its digits


25 is the smallest square that can be written as a sum of 2 squares.

26 is the only positive number to be directly between a square and a cube

28 is the 2nd perfect number









10 comments:

Anand said...

Really interesting facts about numbers....1st blog well written!

divya said...

thanks to introduce me to this aspect of numbers...good obsevation....great work...

shamanth said...

wer r the rest?

swati said...
This comment has been removed by the author.
swati said...

hey i liked all blogs..
1st two r well written..supported by egs like fish tank...good work..

known but interesting facts abt no's.
keep it up!
:)

Deepti V. said...

Hey .. Good one !! But where r the rest ??

sumanth said...

good one.......can any one tell where i can get the rest

sumanth said...

good one.......can any one tell where i can get the rest

Tom Watson said...

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shaik sajid said...

hey the number 4 also have one speciality?