a(n) = floor(H(k) + exp(H(k))*log(H(k))) - sigma(k) where H(k) is the k-th harmonic number Sum_{j=1..k} 1/j and k is the n-th colossally abundant number A004490(n).

A279609

a(n) = floor(H(k) + exp(H(k))*log(H(k))) - sigma(k) where H(k) is the k-th harmonic number Sum_{j=1..k} 1/j and k is the n-th colossally abundant number A004490(n).

Terms

    a(0) =0a(1) =0a(2) =0a(3) =2a(4) =6a(5) =34a(6) =207a(7) =492a(8) =9051a(9) =143828a(10) =306310a(11) =963859a(12) =5155084a(13) =81053635a(14) =1334916490a(15) =29106956400a(16) =58655156200

External references