56, 58, 62, 70, 84, 118, 182

The correct pattern is + 2, + 4, + 8, + 16, + 32, + 64 i.e. + 2, + 2², + 2³, + 2⁴, + 2⁵, + 2⁶.

So, 84 is wrong and must be replaced by (70 + 16) i.e. 86.