20/03/27 02:32:03.81 GzR1OrPK.net
>>913 また間違えた。
Σ[k=1..n] Σ[j=1..k] a[j] /j
= Σ[k=1..n] (n+1-k) a[k] /k
= Σ[k=1..n] (n+1-k) {C[n,k] (-1)^(k-1)}/kk
= {(n+1)/2}{H[n]^2 ＋ Σ[k=1,n] 1/kk} - H[n],
↑
20/03/27 02:32:03.81 GzR1OrPK.net
>>913 また間違えた。
Σ[k=1..n] Σ[j=1..k] a[j] /j
= Σ[k=1..n] (n+1-k) a[k] /k
= Σ[k=1..n] (n+1-k) {C[n,k] (-1)^(k-1)}/kk
= {(n+1)/2}{H[n]^2 ＋ Σ[k=1,n] 1/kk} - H[n],
↑