The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A072261 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A072261

a(n) = 4*a(n-1) + 1, a(1)=7.
(history; published version)

#34 by Harvey P. Dale at Mon Sep 04 11:26:24 EDT 2023

STATUS

editing

approved

#33 by Harvey P. Dale at Mon Sep 04 11:26:20 EDT 2023

MATHEMATICA

NestList[4#+1&, 7, 30] (* or *) LinearRecurrence[{5, -4}, {7, 29}, 30] (* Harvey P. Dale, Sep 04 2023 *)

STATUS

approved

editing

#32 by Charles R Greathouse IV at Thu Sep 08 08:45:06 EDT 2022

PROG

(MAGMAMagma) [(11*4^n -2)/6: n in [1..25]]; // G. C. Greubel, Jan 14 2020

Discussion

Thu Sep 08

08:45

OEIS Server: https://oeis.org/edit/global/2944

#31 by Wolfdieter Lang at Mon Nov 29 18:22:28 EST 2021

STATUS

editing

approved

#30 by Wolfdieter Lang at Mon Nov 29 18:21:11 EST 2021

FORMULA

a(n) = A178415(4, n) = A347834(3, n-1), arrays, for n >= 1. - Wolfdieter Lang, Nov 29 2021

CROSSREFS

Cf. A002450, A072197, A072257, A072258, A072259, A072260, A072262, A099730, A178415, A347834.

STATUS

approved

editing

Discussion

Mon Nov 29

18:22

Wolfdieter Lang: I added the array formulas from A178415 and A347834, and gave their cfs.

#29 by Wolfdieter Lang at Thu Sep 16 15:54:16 EDT 2021

STATUS

editing

approved

#28 by Wolfdieter Lang at Thu Sep 16 15:53:49 EDT 2021

LINKS

<a href="/index/3#3x1">Index entries for sequences related to 3x+1 (or Collatz) problem</a>

STATUS

approved

editing

Discussion

Thu Sep 16

15:54

Wolfdieter Lang: I added the Collatz index link.

#27 by Peter Luschny at Mon Aug 16 14:13:13 EDT 2021

STATUS

reviewed

approved

#26 by Michel Marcus at Mon Aug 16 07:11:08 EDT 2021

STATUS

proposed

reviewed

#25 by Wolfdieter Lang at Mon Aug 16 06:29:46 EDT 2021

STATUS

editing

proposed