A013920 - OEIS

%I #12 Oct 02 2021 15:14:35

%S 4,6,8,9,12,14,15,16,18,20,21,22,25,26,28,30,33,34,35,36,38,39,40,42,

%T 44,45,46,48,49,50,55,56,57,58,60,63,64,65,69,70,72,74,77,78,80,81,82,

%U 84,85,86,90,91,92,94,95,96,98,104,105,106,108,110,111,112,114,115,116,118,119

%N Composite numbers k such that the sum of all composites <= k is composite.

%Y Cf. A013919, A013921.

%K nonn

%O 1,1

%A _N. J. A. Sloane_, _Henri Lifchitz_

%E More terms from _David W. Wilson_