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A217140 a(n) = m/n where m is the least number divisible by n such that phi(m) = phi(m+6n). 2
24, 24, 24, 24, 36, 24, 24, 24, 24, 36, 24, 24, 24, 24, 36, 24, 24, 24, 24, 36, 24, 24, 24, 24, 36, 24, 24, 24, 24, 36, 24, 24, 24, 24, 60, 24, 24, 24, 24, 36, 24, 24, 24, 24, 36, 24, 24, 24, 24, 36, 24, 24, 24, 24, 36, 24, 24, 24, 24, 36, 24, 24, 24, 24, 36 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Michel Marcus, Table of n, a(n) for n = 1..1000

EXAMPLE

A179188(1)=24 is divisible by 1 and the quotient is 24, so a(1)=24.

A217139(1)=48 is divisible by 2 and the quotient is 24, so a(2)=24.

The first solution to phi(n)=phi(n+18) to be divisible by 3 is 72 and the quotient is 24, so a(3)=24.

CROSSREFS

Cf. A007015, A179188, A217139, A217141, A217068.

Sequence in context: A278656 A308419 A010863 * A235249 A115028 A099543

Adjacent sequences:  A217137 A217138 A217139 * A217141 A217142 A217143

KEYWORD

nonn

AUTHOR

Michel Marcus and Jonathan Sondow, Oct 01 2012

STATUS

approved

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Last modified September 26 03:46 EDT 2021. Contains 347664 sequences. (Running on oeis4.)