(-1)sigma perfect numbers: (-1)sigma(a) = m*a for some integer m, where if a = Product p(i)^r(i) then (-1)sigma(a) = Product_{i} (-1 + Sum_{s=1..r(i)} p(i)^s).
A034094
(-1)sigma perfect numbers: (-1)sigma(a) = m*a for some integer m, where if a = Product p(i)^r(i) then (-1)sigma(a) = Product_{i} (-1 + Sum_{s=1..r(i)} p(i)^s).
Terms
- a(0) =1a(1) =20a(2) =312a(3) =9744a(4) =29280a(5) =53352a(6) =1666224a(7) =5006880a(8) =106798080a(9) =133301760a(10) =980733600a(11) =9099742080a(12) =18262471680a(13) =22794600960
External references
- oeis: A034094