A086743 - OEIS

%I #8 Jan 06 2021 22:50:42

%S 1,2,4,5,6,7,8,10,11,13,14,15,16,17,18,19,20,21,22,23,24,25,26,28,29,

%T 31,32,33,34,35,37,38,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,

%U 56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79

%N Numbers n such that the coefficient of x^n equals 0 in Product_{k>=1} (1 - x^(3^k)).

%Y Cf. A074940, A083096.

%K nonn

%O 1,2

%A _Benoit Cloitre_, Jul 29 2003