A087973 Maximal term in Collatz-iteration started at 3^n.

16, 52, 9232, 244, 9232, 2464, 10528, 19684, 88576, 2270104, 1008916, 1594324, 7174456, 65451076, 64570084, 129140164, 1570824736, 1961316232, 8825923024, 10460353204, 47071589416, 105911076184, 423644304724, 66034034786644

Offset

1,1

Links

Table of n, a(n) for n=1..24.

Formula

a(n)=A025586[3^n]=A025586[1+3^(n+1)]=A087972[n+1]

Example

Compare to A087972, when iv=1+3^n.

Mathematica

Table[Max[NestList[If[EvenQ[#], #/2, 3#+1]&, 3^n, 100]], {n, 25}] (* Harvey P. Dale, Dec 08 2011 *)

Crossrefs

Cf. A025586, A087701, A087972.

Sequence in context: A087701 A211586 A232509 * A351584 A332591 A117273

Adjacent sequences: A087970 A087971 A087972 * A087974 A087975 A087976

Keyword

nonn

Author

Labos Elemer, Sep 24 2003

Status

approved