Amicable numbers Amicable numbers are two different numbers where the sum of the proper divisors of one of the numbers is equal to the other. (A proper divisor is a positive integer other than the number itself.) For example, the proper divisors of 220 are 1, 2, 4, 5, 10, 11, 20, 22, 44, 55 & 110, which total 284; the proper divisors of 284 are 1, 2, 4, 71, & 142, which total 220.
In mathematics, what is the name for the following sequence of numbers: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584, 4181, 6765 ...
What is the overall name for a branch of applied mathematics used to study behaviour in strategic situations, in which an individual's success in making choices depends on the choices of others?
