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A066605 Numbers k such that phi(k)/lambda(k) increases to a record value, where phi(k) is the Euler totient function (A000010) and lambda(k) is the Carmichael lambda function (A002322). 2

%I

%S 1,8,24,63,80,240,455,819,1365,2387,2720,3276,3591,4095,7280,9139,

%T 13104,18981,21483,21840,24605,32760,44289,45695,63973,122915,132867,

%U 172081,191919,246753,319865,520025,575757,860405,959595,1233765

%N Numbers k such that phi(k)/lambda(k) increases to a record value, where phi(k) is the Euler totient function (A000010) and lambda(k) is the Carmichael lambda function (A002322).

%H Amiram Eldar, <a href="/A066605/b066605.txt">Table of n, a(n) for n = 1..88</a>

%t a = 0; c = {}; Do[ b = EulerPhi[n]/CarmichaelLambda[n]; If[ b > a, a = b; c = Append[c, n]], {n, 1, 10^7}]; c

%Y Cf. A000010, A002322.

%K nonn

%O 1,2

%A _Robert G. Wilson v_, Jan 13 2002

%E Title improved by _Amiram Eldar_, Jul 20, 2019

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Last modified September 21 16:31 EDT 2021. Contains 347598 sequences. (Running on oeis4.)