Friday, December 12, 2008

495

495 = 32 x 5 x 11.

495 is the Kaprekar constant for three-digit numbers. Arrange the digits of any three-digit number whose digits are not all the same in descending and ascending order, compute the difference, then repeat the process. For example: 311 - 113 = 198; 981 - 189 = 792; 972 - 279 = 693; 963 - 369 = 594; 954 - 459 = 495.

495 is the ninth pentatope number.

495 is a number that cannot be written as a sum of three squares.


Interstate 495 (Capital Beltway) is a highway that surrounds Washington, D.C.

1 comment:

Anonymous said...

If you want to discover more Kaprekar numbers, you can use the Kaprekar Series Generator at http://kaprekar.sourceforge.net/