9/8
17
204, 136, 153.
The GCF is 17.
153
102, 119, 136, 153, 170, 187, 204, 221, 238, 255, 272, 289, . . .
No. The closest triangle numbers to 145 are 136 and 153.
39.5882
17, 34, 51, 68, 85, 102, 119, 136, 153, 170, . . .
141.6666667
They are 105, 120, 136, 153, 171 and 190.
The GCF is 17.
17 34 51 68 85 102 119 136 153 170