1118273

Appears in sequences

• Numerator of the product of the n-th triangular number and the n-th harmonic number.at n=11A119786
• Numerator of absolute value of Sum_{k=1..n} (-1)^(k+1)*(2*k+1)*(Sum_{i=1..k} 1/i).at n=11A120284
• Denominator of H(n)/H(n-1), where H(n) is the n-th harmonic number = Sum_{k=1..n} 1/k.at n=11A193758
• Numerators of constants A(a) related to the asymptotic LCM of arithmetic progressions a*n+b (a and b coprime).at n=12A249225
• Number of subsets of {1..n} whose elements have the same number of prime factors, counted with multiplicity.at n=57A339511
• a(n) = A003418(n+1)*H(n), where H(n) = 1 + 1/2 + ... + 1/n is the n-th harmonic number.at n=11A379561