ATM and Srinivas Ramanujan

Recently I came across a link between ATM and Srinivas Ramanujan(A mathematical genius of India).When your automated teller machines divide and arrange your money before coughing it up, they are all using Ramanujan's partition theory.
Partition theory is as follows.

A partition of a positive integer n is just an expression for n as a sum of positive integers, regardless of order. Thus p(4) = 5 because 4 can be written as 1+1+1+1, 1+1+2, 2+2, 1+3, or 4. The problem of finding p(n) was studied by Euler, who found a formula for the generating function of p(n) (that is, for the infinite series whose nth term is p(n)xn). While this allows one to calculate p(n) recursively, it doesn't lead to an explicit formula. Hardy and Ramanujan came up with such a formula (though they only proved it works asymptotically; Rademacher proved it gives the exact value of p(n)).