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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: A308419 A010863 A362116 * 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 July 23 04:43 EDT 2024. Contains 374544 sequences. (Running on oeis4.)