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

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

1,1

Links

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

Formula

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

Crossrefs

Cf. A025586, A087701, A087972.

Sequence in context: A306781 A154132 A152458 * A127919 A366478 A074092

Adjacent sequences: A087968 A087969 A087970 * A087972 A087973 A087974

Keyword

nonn

Author

Labos Elemer, Sep 24 2003

Status

approved