The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A258822 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A258822

Number of times that k iterations of n under the '3x+1' map yield k for some k.
(history; published version)

#12 by OEIS Server at Mon Nov 06 11:07:48 EST 2023

LINKS

Paolo Xausa, <a href="/A258822/b258822_1.txt">Table of n, a(n) for n = 1..10000</a>

#11 by Michael De Vlieger at Mon Nov 06 11:07:48 EST 2023

STATUS

reviewed

approved

Discussion

Mon Nov 06

11:07

OEIS Server: Installed first b-file as b258822.txt.

#10 by Michel Marcus at Mon Nov 06 08:42:30 EST 2023

STATUS

proposed

reviewed

#9 by Paolo Xausa at Mon Nov 06 07:47:02 EST 2023

STATUS

editing

proposed

#8 by Paolo Xausa at Mon Nov 06 07:44:41 EST 2023

LINKS

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

#7 by Paolo Xausa at Mon Nov 06 07:42:41 EST 2023

LINKS

Paolo Xausa, <a href="/A258822/b258822_1.txt">Table of n, a(n) for n = 1..10000</a>

MATHEMATICA

A258822[n_]:=Count[MapIndexed[{#1}==#2-1&, NestWhileList[If[OddQ[#], 3#+1, #/2]&, n, #>1&]], True]; Array[A258822, 100] (* Paolo Xausa, Nov 06 2023 *)

STATUS

approved

editing

#6 by N. J. A. Sloane at Tue Jun 16 14:02:26 EDT 2015

STATUS

proposed

approved

#5 by Derek Orr at Thu Jun 11 18:35:57 EDT 2015

STATUS

editing

proposed

#4 by Derek Orr at Thu Jun 11 18:35:55 EDT 2015

COMMENTS

The number 3 appears first at a(63105). Do all nonnegative numbers appear? See A258824.

STATUS

proposed

editing

#3 by Derek Orr at Thu Jun 11 17:25:20 EDT 2015

STATUS

editing

proposed