Numbers n such that sum k/d(k) is an integer, where d(k) is the k-th divisor of n (the divisors of n are in increasing order).

A073082

Numbers n such that sum k/d(k) is an integer, where d(k) is the k-th divisor of n (the divisors of n are in increasing order).

Terms

    a(0) =1a(1) =2a(2) =9a(3) =10a(4) =39a(5) =348a(6) =1272a(7) =10682a(8) =18275a(9) =414912a(10) =5606336a(11) =8712340a(12) =20920564a(13) =47201552a(14) =140142814a(15) =240574848a(16) =5459371212a(17) =16993264107a(18) =22955387784a(19) =23807694876a(20) =33482496720

External references