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 (4,k)-perfect numbers.
A019293
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 (4,k)-perfect numbers.
Terms
- a(0) =1a(1) =2a(2) =3a(3) =4a(4) =6a(5) =8a(6) =10a(7) =12a(8) =15a(9) =18a(10) =21a(11) =24a(12) =26a(13) =32a(14) =39a(15) =42a(16) =60a(17) =65a(18) =72a(19) =84a(20) =96a(21) =160a(22) =182a(23) =336a(24) =455a(25) =512a(26) =672a(27) =896a(28) =960a(29) =992
External references
- oeis: A019293