Numbers n such that sigma(x) - x = n has at least two solutions, with each x having the same squarefree kernel, where sigma(x) is the sum of divisor function (A000203).
A252997
Numbers n such that sigma(x) - x = n has at least two solutions, with each x having the same squarefree kernel, where sigma(x) is the sum of divisor function (A000203).
Terms
- a(0) =218a(1) =189648a(2) =720240a(3) =119967120a(4) =129705984a(5) =517941905a(6) =707902440a(7) =1321744320a(8) =98890370304a(9) =99080219520a(10) =119922568640a(11) =139834382688a(12) =347612467648a(13) =580542318720a(14) =952717920000
External references
- oeis: A252997