A061523 - OEIS

A061523

Integer part of the blowup factor for A025587(n).

1, 5, 7, 10, 341, 356, 701, 1600, 1776, 2806, 3994, 9729, 20224, 21891, 107860, 115180, 131346, 204765, 221646, 284348, 426522, 748056, 9099150, 15596837, 27297444, 30359613, 4422186001

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OFFSET

0,2

LINKS

Table of n, a(n) for n=0..26.

EXAMPLE

a(4)=10 since A025587(4)=15 and starting with 15 in the Collatz sequence gives a maximum value of 160 with a blowup factor of 160/15 = 10.66666...

MATHEMATICA

With[{s = Array[Max@ NestWhileList[If[EvenQ@ #, #/2, 3 # + 1] &, #, # > 1 &]/# &, 2^18]}, Floor@ Union@ FoldList[Max, s]] (* Michael De Vlieger, Mar 13 2018 *)

CROSSREFS

Cf. A025587, A295163.

Sequence in context: A215660 A015849 A059303 * A119653 A023592 A076546

Adjacent sequences: A061520 A061521 A061522 * A061524 A061525 A061526

KEYWORD

nonn

AUTHOR

Larry Reeves (larryr(AT)acm.org), May 03 2001

STATUS

approved