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A087701 Maximal term in Collatz-iteration started at -1+2^n. 4
1, 16, 52, 160, 9232, 9232, 4372, 13120, 39364, 118096, 1276936, 1276936, 6810136, 9565936, 28697812, 86093440, 1570824736, 1570824736, 2324522932, 6973568800, 20920706404, 62762119216, 188286357652, 564859072960, 9161049517720 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..25.

FORMULA

a(n) = A025586(2^n-1).

MATHEMATICA

Table[Max[NestWhileList[If[EvenQ[#], #/2, 3#+1]&, 2^n-1, #>1&]], {n, 30}] (* Harvey P. Dale, Jul 19 2019 *)

CROSSREFS

Cf. A025586.

Sequence in context: A211578 A211592 A235653 * A211586 A232509 A087973

Adjacent sequences:  A087698 A087699 A087700 * A087702 A087703 A087704

KEYWORD

nonn

AUTHOR

Labos Elemer, Sep 24 2003

STATUS

approved

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Last modified October 15 20:04 EDT 2019. Contains 328037 sequences. (Running on oeis4.)