A087972 -id:A087972 - cp's OEIS frontend

A087970 Maximal term in Collatz-iteration started at 2^n+1.

2, 16, 16, 52, 52, 100, 196, 9232, 9232, 1540, 3076, 9232, 12292, 24580, 49156, 98308, 196612, 393220, 786436, 1572868, 3145732, 6291460, 12582916, 25165828, 50331652, 100663300, 201326596, 402653188, 805306372, 1610612740, 3221225476, 6442450948, 12884901892

Offset: 0

Labos Elemer, Sep 24 2003

nonn

Amiram Eldar, Table of n, a(n) for n = 0..1000

Cf. A000051, A025586, A087701, A087972.

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

Offset changed to 0, a(0) prepended and more terms added by Amiram Eldar, Jun 04 2024

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

Original entry on oeis.org

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

Labos Elemer, Sep 24 2003

nonn

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

Cf. A025586, A087701, A087972.

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

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

Original entry on oeis.org

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

Labos Elemer, Sep 24 2003

nonn

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

Cf. A025586, A087701, A087972.

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

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

cp's OEIS Frontend

A087970 Maximal term in Collatz-iteration started at 2^n+1.

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

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

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