Numbers k such that Sum_{j=1..k} sigma(j)^j == 0 (mod k).
A229208
Numbers k such that Sum_{j=1..k} sigma(j)^j == 0 (mod k).
Terms
- a(0) =1a(1) =2a(2) =9a(3) =55a(4) =758a(5) =16685a(6) =29224a(7) =84293a(8) =87018a(9) =98122
External references
- oeis: A229208