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n+[nr/s]+[nt/s], where r=sqrt(2), s=sqrt(3), t=sqrt(5), and []=floor.
6

%I #10 Jul 01 2017 02:55:15

%S 2,5,8,12,15,17,21,24,27,30,33,36,39,43,46,49,51,55,58,61,65,67,70,73,

%T 77,80,83,86,89,92,96,99,101,104,108,111,114,118,120,123,126,130,133,

%U 135,139,142,145,148,152,154,157,161,164,167,170,173,176,179,183,185,188,192,195,198

%N n+[nr/s]+[nt/s], where r=sqrt(2), s=sqrt(3), t=sqrt(5), and []=floor.

%C See A184812.

%H G. C. Greubel, <a href="/A184813/b184813.txt">Table of n, a(n) for n = 1..10000</a>

%t (See A184812.)

%o (PARI) a(n) = n + floor(n*sqrt(2/3)) + floor(n*sqrt(5/3)); \\ _Michel Marcus_, Jul 01 2017

%Y Cf. A184812, A184814.

%K nonn

%O 1,1

%A _Clark Kimberling_, Jan 22 2011