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A130669 Smallest k such that phi(x) = k has exactly n odd solutions. 2
1, 6, 24, 60, 144, 72, 216, 480, 600, 240, 432, 1152, 1296, 1080, 4608, 2016, 720, 2520, 2400, 1440, 5184, 4032, 2880, 5280, 7776, 2160, 5760, 21840, 7560, 9600, 6720, 16560, 5040, 15552, 6480, 13440, 10800, 11520, 20736, 4320, 18144, 12096, 28512, 16800 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Vladeta Jovovic and Donovan Johnson, Table of n, a(n) for n = 1..1000 (first 100 terms from Vladeta Jovovic)

EXAMPLE

a(3) = 24 because there are 3 odd solutions (35, 39, 45) to phi(x) = 24 and for every k < 24 the number of odd solutions to phi(x) = k is unequal to 3.

CROSSREFS

Cf. A007374, A130670.

Sequence in context: A329119 A258345 A258351 * A214308 A237350 A265393

Adjacent sequences: A130666 A130667 A130668 * A130670 A130671 A130672

KEYWORD

nonn

AUTHOR

Franz Vrabec, Jun 27 2007

STATUS

approved

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Last modified November 29 18:13 EST 2022. Contains 358431 sequences. (Running on oeis4.)