| This sequence should include odd perfect numbers too, if they exist.
There are no other terms below 2*10^9.
..Abundancy(n)..............n.............2n.......sigma(n)..difference
1.99480519480519.........1155...........2310...........2304.........-.6
2.00067226890756.........8925..........17850..........17856...........6
2.00018492834027........32445..........64890..........64896...........6
2.00001356346004.......442365.........884730.........884736...........6
2.00000011318610....159030135......318060270......318060288..........18
1.99999999264376....815634435.....1631268870.....1631268864.........-.6
As it happens, abundance-radius of these is -6, 6 or 18. This is not necessarily true for larger terms.
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