A087971 Maximal term in Collatz-iteration started at 3^n-1.

2, 8, 40, 80, 9232, 9232, 3280, 6560, 29524, 59048, 1276936, 1276936, 6810136, 6810136, 21523360, 43046720, 1570824736, 1570824736, 1743392200, 3486784400, 17651846032, 31381059608, 141214768240, 282429536480, 9161049517720

Offset: 1

Author

Labos Elemer, Sep 24 2003

Keywords

• nonn

Links

• Amiram Eldar, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A025586, A087701, A087972.

Formula

a(n) = A025586(3^n-1).