Decomposition factor: 98 = 2× 7× 7.
1、98= 14×7
If n=7, A 1 = 4, an =104+5+6+7+8+9+10 = 49.
If n= 14, there is no solution.
2、98=2×49
If n=2, a 1 = 24, an = 25 24+25 = 49.
If n=49, there is no solution.
3. When "several" can be expressed as "1", the answer is 49.