-2216

Appears in sequences

• Square array T(n,k), n >= 1, k >= 0, read by antidiagonals downwards, where T(n,k) = Sum_{j=1..n} (-k)^(floor(n/j) - 1).at n=62A345033
• a(n) = Sum_{k=1..n} (-3)^(floor(n/k) - 1).at n=7A345035
• Square array A(n,k), n >= 1, k >= 1, read by antidiagonals downwards, where A(n,k) = Sum_{d|n} phi(n/d) * (-k)^(d-1).at n=52A382995
• a(n) = Sum_{d|n} phi(n/d) * (-3)^(d-1).at n=7A383000