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A258781 a(n) is the greatest positive integer k such that lambda(k) <= n where lambda is the Carmichael lambda function (A002322). 0
2, 24, 24, 240, 240, 504, 504, 504, 504, 504, 504, 65520, 65520, 65520, 65520, 65520, 65520, 65520, 65520, 65520, 65520, 65520, 65520, 131040, 131040, 131040, 131040, 131040, 131040, 171864, 171864, 171864, 171864, 171864, 171864, 138181680, 138181680, 138181680 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..38.

Eric W. Weisstein's mathWorld, Carmichael Function

EXAMPLE

a(2)=24 because lambda(24) = 2 and 24 is the greatest number such that lambda(24) <= 2.

MAPLE

with(numtheory):

for n from 1 to 30 do:

  ii:=0:

   for k from 10^7 by -1 to 1 while(ii=0)do:

   if lambda(k)<=n

   then

   printf(`%d, `, k):ii:=1:

   else

   fi:

  od:

od:

CROSSREFS

Cf. A002322, A253215.

Sequence in context: A229429 A281139 A052686 * A064818 A022374 A139334

Adjacent sequences:  A258778 A258779 A258780 * A258782 A258783 A258784

KEYWORD

nonn

AUTHOR

Michel Lagneau, Jun 10 2015

EXTENSIONS

a(36)-a(38) corrected by Seth A. Troisi, Nov 22 2015

STATUS

approved

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Last modified October 22 10:20 EDT 2019. Contains 328317 sequences. (Running on oeis4.)