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 A217141 Numbers n such that phi(n) = phi(n+12) and are not divisible by 2. 5
 143, 157, 203, 247, 273, 1147, 1209, 1679, 2147, 2279, 2375, 2445, 2705, 2747, 4331, 4687, 5049, 6107, 7367, 7835, 7869, 7979, 7991, 9167, 12127, 17145, 18501, 18753, 18981, 19803, 22987, 26733, 27359, 29097, 29987, 32829, 35485, 35763, 37653, 37851, 39907 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Donovan Johnson, Table of n, a(n) for n = 1..1000 PROG (PARI) {op=vector(N=12); Nd6=N/6; for( n=1, 1e4, if( op[n%N+1]+0==op[n%N+1]=eulerphi(n), if ((n-N) % Nd6 != 0, print1(n-N, ", "))))} CROSSREFS Cf. A000010, A179188, A217139. Sequence in context: A296887 A293755 A160781 * A097435 A350735 A073954 Adjacent sequences: A217138 A217139 A217140 * A217142 A217143 A217144 KEYWORD nonn AUTHOR Michel Marcus, Sep 27 2012 STATUS approved

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Last modified July 22 23:31 EDT 2024. Contains 374544 sequences. (Running on oeis4.)