Fibonacci PSP allows you to calculate the Fibonacci sequence from your psp.
In a recreational problem posed in one of his books, the Liber Abaci, Fibonacci describes the growth of a population of rabbits
"Having initially a couple of rabbits, how many couples do you get twelve months if each couple generates every month a new couple from the second month of its existence? "
If you want to know more about the theoretical part of this suite, we invite you to discover Wikipedia