which number should come next in this series?3,5,8,13,21,……

问题描述:

which number should come next in this series?
3,5,8,13,21,……

34
斐波那契数列的一部分

3+5=8;
5+8=13;
8+13=21;
13+21=34

34

前两数之后等于后一个数
3+5=8,5+8=13....
所以13+21=34