Numbers m = Sum_{k=1..n} sigma(k) such that Sum_{k=1..n} sigma(k) is divisible by k.
A168133
Numbers m = Sum_{k=1..n} sigma(k) such that Sum_{k=1..n} sigma(k) is divisible by k.
Terms
- a(0) =1a(1) =4a(2) =56a(3) =99a(4) =238a(5) =3276a(6) =26820a(7) =55167a(8) =550514a(9) =3842258a(10) =16222973a(11) =56731455a(12) =118396264a(13) =396379039896
External references
- oeis: A168133