Numbers n such that h(n) = 3 h(n-1) where h(n) is the length of the sequence {n, f(n), f(f(n)), ...., 1} in the Collatz (or 3x + 1) problem. (The earliest "1" is meant.)
A078420
Numbers n such that h(n) = 3 h(n-1) where h(n) is the length of the sequence {n, f(n), f(f(n)), ...., 1} in the Collatz (or 3x + 1) problem. (The earliest "1" is meant.)
Terms
- a(0) =105a(1) =548a(2) =683a(3) =1508a(4) =3652a(5) =4278a(6) =4295a(7) =8145a(8) =8150a(9) =9417a(10) =9419a(11) =18247a(12) =18287a(13) =18370a(14) =18433a(15) =18586a(16) =18695a(17) =18706a(18) =18742a(19) =18945a(20) =22024a(21) =22140a(22) =22311a(23) =22324a(24) =22708a(25) =22714a(26) =25336a(27) =25681a(28) =25771a(29) =25777
External references
- oeis: A078420