text: what is the next number in this sequence? 1, 3, 11, 67, ?   1  ==>  times 2,  plus 1  ==>  = 3    3  ==>  times 4, minus 1  ==>  = 11   11  ==>  times 6,  plus 1  ==>  = 67  and so the next number in the sequence will be    67  ==>  times 8, minus 1  ==>  = 535