If the positive integer m satisfies 10m-1 < 2512 < 10m, then M=______ .(lg2≈0.3010)

If the positive integer m satisfies 10m-1 < 2512 < 10m, then M=______ .(lg2≈0.3010)

∵ 10m-1 < 2512 < 10m, take the logarithm with 10 as the base to get lg10m-1 < lg2512 < lg10m, that is, M-1 < 512 × LG2 < m and ∵ LG2 ≈ 0.3010 ∵ M-1 < 154.112 < m, because m is a positive integer, so & nbsp; m = 155, so the answer is 155