Length of iteration sequence of shortest unimodal Collatz (3x+1)/2 sequence that begins with exactly n increases and ends with continuous decreases until reaching 1.
A381705
Length of iteration sequence of shortest unimodal Collatz (3x+1)/2 sequence that begins with exactly n increases and ends with continuous decreases until reaching 1.
Terms
- a(0) =3a(1) =6a(2) =13a(3) =32a(4) =87a(5) =250a(6) =737a(7) =2196a(8) =6571a(9) =19694a(10) =59061a(11) =177160a(12) =531455a(13) =1594338a(14) =4782985a(15) =14348924a(16) =43046739a(17) =129140182a(18) =387420509a(19) =1162261488a(20) =3486784423a(21) =10460353226a(22) =31381059633a(23) =94143178852a(24) =282429536507a(25) =847288609470
External references
- oeis: A381705