Pei Fibonacci (Fibonacci leonardo, about 1170-1250) is famous Italian mathematician. In many interesting questions "abacus book" in his book, the most successful of the question is the famous "Rabbit breeding problem": If every month rabbits breeding a pair of rabbit, rabbit and child after birth the second month have reproductive capacity, how much can one pair of rabbits a year of the rabbit breeding?
This issue will constitute a Fibonacci number
| month | For several rabbits | The number of new rabbit | The total number of rabbits | Rabbit logarithmic | Add the rabbit logarithmic |
| 1 | 2 | 0 | 2 | 1 | 0 |
| 2 | 2 | 2 | 4 | 2 | 1 |
| 3 | 4 | 2 | 6 | 3 | 1 |
| 4 | 6 | 4 | 10 | 5 | 2 |
| 5 | 10 | 6 | 16 | 8 | 3 |
| 6 | 16 | 10 | 26 | 13 | 5 |
| 7 | 26 | 16 | 42 | 21 | 8 |
Therefore rabbit logarithm: 1,2,3,5,8,13,21, ... plus 1 is in its previous Fibonacci number
Each time the number of new Rabbit is: 0,1,1,2,3,5,8, ..., delete 0 in front is Fibonacci number
The total number of rabbits that deed Fibonacci number of columns: 1,1,2,3,5,8,13,21, ...
Where n is the month.