A130669 Smallest k such that phi(x) = k has exactly n odd solutions.

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

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: A371044 A258345 A258351 * A214308 A237350 A265393

Adjacent sequences: A130666 A130667 A130668 * A130670 A130671 A130672

Keyword

nonn

Author

Franz Vrabec, Jun 27 2007

Status

approved