+---+-------------+--------------------+-------------------+
|n|a(n)/a(n+1)|连分数|注释|
+---+-------------+--------------------+-------------------+
|1|1/2|[0;2]|2=素数(a(1))|
+---+-------------+--------------------+-------------------+
|2|2/7|[0;3,2]|3=素数(a(2))|
+---+-------------+--------------------+-------------------+
|3|7/121|[0;17,3,2]|17=素数(a(3))|
+---+-------------+--------------------+-------------------+
|4 | 121/779988 |[0;661,17,3,2]| 661=素数(a(4))|
+---+-------------+--------------------+-------------------+
|