A217141 Numbers n such that phi(n) = phi(n+12) and are not divisible by 2.

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

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