Numbers z such that there exist two integers 0<x<=y<=z such that (x^2/sigma(x)^2 + y^2/sigma(y)^2 + z^2/sigma(z)^2) * (x + y + z)^2 = x^2 + y^2 + z^2.
A385749
Numbers z such that there exist two integers 0<x<=y<=z such that (x^2/sigma(x)^2 + y^2/sigma(y)^2 + z^2/sigma(z)^2) * (x + y + z)^2 = x^2 + y^2 + z^2.
Terms
- a(0) =120a(1) =672a(2) =1740a(3) =2556a(4) =4680a(5) =11556a(6) =27312a(7) =32136a(8) =41412a(9) =41952a(10) =42168
External references
- oeis: A385749