Two numbers are amicable or “friendly” if each is equal to the sum of the natural number divisors of the other. This is excluding the numbers themselves. The first pair of amicable numbers, (220 & 284) are said to have[…]

# Category: Advanced Number Curiosities

March
21
2016

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March
22
2016

## Harshad Numbers

- LOCATED IN Advanced Number Curiosities

In recreational mathematics, a Harshad number in a given number base, is an integer that is divisible by the sum of its digits when written in that base. For example take the number 312. The sum of its digits equal 3 + 1 +[…]

March
23
2016

## Kaprekar’s Process

- LOCATED IN Advanced Number Curiosities

The Kaprekar process was named for the well-known Indian mathematician D.R. Kaprekar and focuses on four-digit numbers which are very unique. Take any four-digit number, (make sure that not all digits are the same) and arrange its digits in both[…]