Let sigma_m (n) be result of applying sum-of-divisors function m times to n; call n (m,k)-perfect if sigma_m (n) = k*n; sequence gives the (2,12)-perfect numbers.
A019289
Let sigma_m (n) be result of applying sum-of-divisors function m times to n; call n (m,k)-perfect if sigma_m (n) = k*n; sequence gives the (2,12)-perfect numbers.
Terms
- a(0) =2200380a(1) =8801520a(2) =14913024a(3) =35206080a(4) =140896000a(5) =459818240a(6) =775898880a(7) =2253189120a(8) =16785793024a(9) =22648550400a(10) =36051025920a(11) =51001180160a(12) =144204103680
External references
- oeis: A019289