Least integer k for which sigma(k - x) + sigma(k + x) >= n*k has at least one solution.
A383921
Least integer k for which sigma(k - x) + sigma(k + x) >= n*k has at least one solution.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =24a(4) =91a(5) =841a(6) =13861a(7) =360361
External references
- oeis: A383921