漫游岛认证
1. 等差数列
(1) 1,3,5,7,9,11,…,2n-1(n为正整数)
(3) 5,8,11,14,17,20,…,3n+2(n为正整数)
2. 等比数列
(2) 1,2,4,8,16,32,…,2n-1(n为正整数)
(3) 3,5,9,17,33,65,…,2n+1(n为正整数)
(4) 1,3,7,15,31,63,…,2n-1(n为正整数)