-6617

Appears in sequences

• First term of the n-th differences of the squarefree numbers. Inverse zero-based binomial transform of A005117.at n=15A377041
• a(n) = numerator( (-1)^(n-1)*H(2*n)/(2*n + 1) ), where H(n) is the n-th harmonic number.at n=6A392689