Numbers k for which sigma(k)/k - 1/4 is an integer.
A218404
Numbers k for which sigma(k)/k - 1/4 is an integer.
Terms
- a(0) =40a(1) =224a(2) =360a(3) =2016a(4) =174592a(5) =524160a(6) =1571328a(7) =492101632a(8) =4428914688
External references
- oeis: A218404