(20 13 Zhenjiang) earthquake, the Richter scale increased by 1, and the released energy increased to 32 times, so the energy released by the Richter scale earthquake was 32.4 times that released by the magnitude 3 earthquake.

Test center: the power of power and the power of products.

Analysis: Assuming that the energy released by an earthquake of magnitude N on the Richter scale is 324 times that released by an earthquake of magnitude 3, the equation 32n- 1=323- 1×324 can be obtained according to the meaning of the question, and the solution of the equation can be obtained.

Solution: Assume that the energy released by an earthquake of magnitude N on the Richter scale is 324 times that released by an earthquake of magnitude 3.

Then 32n- 1=323- 1×324,

32n- 1=326，

n- 1=6，

n=7。

So the answer is: 7.