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.
Source: Wolfram MathWorld
1 comment:
If you want to discover more Kaprekar numbers, you can use the Kaprekar Series Generator at http://kaprekar.sourceforge.net/
Post a Comment