Numbers m with half-integral abundancy index, sigma(m)/m = k+1/2 with integer k.
A159907
Numbers m with half-integral abundancy index, sigma(m)/m = k+1/2 with integer k.
Terms
- a(0) =2a(1) =24a(2) =4320a(3) =4680a(4) =26208a(5) =8910720a(6) =17428320a(7) =20427264a(8) =91963648a(9) =197064960a(10) =8583644160a(11) =10200236032a(12) =21857648640a(13) =57575890944a(14) =57629644800a(15) =206166804480
External references
- oeis: A159907