Numbers k such that (1/k)*sigma(k+1) is an integer.
A110817
Numbers k such that (1/k)*sigma(k+1) is an integer.
Terms
- a(0) =1a(1) =2a(2) =9a(3) =135a(4) =32895a(5) =2147516415
External references
- oeis: A110817
A110817
Numbers k such that (1/k)*sigma(k+1) is an integer.