郑小红同学

给定数列1,1,1,3,5,9,17,…，从第4项开始，每项都是前3项的和。求 第20190324项的最后4位数字。

[统计素数求和.jpg](https://p6-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/b758a069b4114f6f811cf2ccc46d7023~tplv

[口诀表.jpg](https://p6-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/3c54add9285c4c4f8e57d4c8e2225e77~tplv-k3

![数位寻数.png](https://p1-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/358616eda0ac4db88cdff2e2c060d408~tplv-

[水仙花.jpg](https://p6-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/de6bde3ec9164de0a9027dc5fe03b6aa~tplv-k3

![随机猜数.jpg](https://p9-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/692d102a125b446bab0e9573d38da875~tplv-