Numbers k for which sigma(k)/k - 3/4 is an integer.
A218405
Numbers k for which sigma(k)/k - 3/4 is an integer.
Terms
- a(0) =4a(1) =47616a(2) =293760a(3) =1782144a(4) =3485664a(5) =134209536a(6) =282977280a(7) =746444160a(8) =1459956960a(9) =1684126080a(10) =1716728832a(11) =27298252800a(12) =41233360896a(13) =376591138560a(14) =719045268480
External references
- oeis: A218405