121 = 11 × 11
1997 is already prime; no tree.
11 x 11 = 121
121 = 112
112
121 = 112
121 = 11 × 11
112 = 121
112 = 121
112 = 121
1997 is already prime; no tree.
121 = 11 * 11 = 112
11 x 11 = 121
121 = 112
11 x 11 = 121
It is: 11*11 = 121 or as 112 = 121
112