* 估算公式:E(T)=n⋅Hn=nlogn+γn+12+o(1),asn→∞,E(T)=n⋅Hn=nlogn+γn+12+o(1),asn→∞, where γ≈0.5772156649γ≈0.5772156649 is the [[http://en.wikipedia.org/wiki/Euler%E2%80%93Mascheroni_constant | Euler–Mascheroni constant]].
* 估算公式:E(T)=n⋅Hn=nlogn+γn+12+o(1),asn→∞,E(T)=n⋅Hn=nlogn+γn+12+o(1),asn→∞, where γ≈0.5772156649γ≈0.5772156649 is the [[http://en.wikipedia.org/wiki/Euler%E2%80%93Mascheroni_constant | Euler–Mascheroni constant]].