The required number of steps should be 1, less than the common multiple of 2, 3, 5 and 6 (that is, the multiple of 30) and the multiple of 7.

Therefore, it is enough to find a multiple of 7 from 29,59,89, 1 19, 149.

So the answer is 1 19.

Answer: This ladder has 1 19 steps.

So the answer is: 1 19.