a(n) = the smallest numbers k such that sigma(k+sigma(k)) = n*sigma(k) or -1 if no solution exists or has been found for n.
A246909
a(n) = the smallest numbers k such that sigma(k+sigma(k)) = n*sigma(k) or -1 if no solution exists or has been found for n.
Terms
- a(0) =-1a(1) =2a(2) =1a(3) =28a(4) =15456a(5) =831376
External references
- oeis: A246909