Numbers k such that Sum_{i=1..k} i^sigma(i) == 0 (mod k).
A227427
Numbers k such that Sum_{i=1..k} i^sigma(i) == 0 (mod k).
Terms
- a(0) =1a(1) =3a(2) =17a(3) =64a(4) =223a(5) =816a(6) =3536a(7) =22704a(8) =27549a(9) =401311
External references
- oeis: A227427