cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-4 of 4 results.

A087972 Maximal term in Collatz-iteration started at 3^n+1.

Original entry on oeis.org

2, 4, 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: 0

Views

Author

Labos Elemer, Sep 24 2003

Keywords

Links

Crossrefs

Cf. A025586, A087701, A087973.

Formula

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

Extensions

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

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

Original entry on oeis.org

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

Views

Author

Labos Elemer, Sep 24 2003

Keywords

Links

Crossrefs

Cf. A000051, A025586, A087701, A087972.

Formula

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

Extensions

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

Views

Author

Labos Elemer, Sep 24 2003

Keywords

Links

Crossrefs

Cf. A025586, A087701, A087972.

Formula

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

Views

Author

Labos Elemer, Sep 24 2003

Keywords

Examples

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

Crossrefs

Cf. A025586, A087701, A087972.

Programs

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

Formula

a(n)=A025586[3^n]=A025586[1+3^(n+1)]=A087972[n+1]
Showing 1-4 of 4 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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