Tiếng Anh qua các bài toán bài số 70

Abstract

Solution. The sequence starts with 1. The next term is determined from the previous one by reading it digit by digit and grouping the numbers that are repeated consecutively. For example, looking at the first term then read one (number) one, then the second term is 11 ; looking at the second term then read two (number) one, then the third term is 21 ; and so on,...