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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
1, 8, 24, 63, 80, 240, 455, 819, 1365, 2387, 2720, 3276, 3591, 4095, 7280, 9139, 13104, 18981, 21483, 21840, 24605, 32760, 44289, 45695, 63973, 122915, 132867, 172081, 191919, 246753, 319865, 520025, 575757, 860405, 959595, 1233765 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..88

MATHEMATICA

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

CROSSREFS

Cf. A000010, A002322.

Sequence in context: A317234 A049724 A060602 * A066497 A205963 A208895

Adjacent sequences:  A066602 A066603 A066604 * A066606 A066607 A066608

KEYWORD

nonn

AUTHOR

Robert G. Wilson v, Jan 13 2002

EXTENSIONS

Title improved by Amiram Eldar, Jul 20, 2019

STATUS

approved

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Last modified July 29 17:41 EDT 2021. Contains 346346 sequences. (Running on oeis4.)