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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 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.)