Numbers n such that A307159(n) = Sum_{k=1..n} bsigma(k) is divisible by n, where bsigma(k) is the sum of bi-unitary divisors of k (A188999).

A307161

Numbers n such that A307159(n) = Sum_{k=1..n} bsigma(k) is divisible by n, where bsigma(k) is the sum of bi-unitary divisors of k (A188999).

Terms

    a(0) =1a(1) =2a(2) =17a(3) =37a(4) =50a(5) =56a(6) =391a(7) =919a(8) =1399a(9) =2829a(10) =6249a(11) =13664a(12) =28829a(13) =62272a(14) =67195a(15) =585391a(16) =5504271a(17) =6798541a(18) =10763933a(19) =866660818a(20) =3830393407a(21) =11044287758a(22) =23058607363a(23) =83159875881a(24) =206501883259a(25) =297734985607

External references