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a(n) = n OR 3n, where OR is bitwise OR.
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%I #5 Aug 02 2015 12:52:23

%S 0,3,6,11,12,15,22,23,24,27,30,43,44,47,46,47,48,51,54,59,60,63,86,87,

%T 88,91,94,91,92,95,94,95,96,99,102,107,108,111,118,119,120,123,126,

%U 171,172,175,174,175,176,179,182,187,188,191,182,183,184,187,190,187,188

%N a(n) = n OR 3n, where OR is bitwise OR.

%t f[n_] := BitOr[n, 3n]; Array[f, 61, 0] (* _Robert G. Wilson v_, Jun 28 2010 *)

%Y Cf. A163617, A178891, A178892, A178893, A178894, A178895, A178896, A178897.

%K nonn

%O 0,2

%A _Dmitry Kamenetsky_, Jun 21 2010

%E More terms from _Robert G. Wilson v_, Jun 28 2010