A024370 - OEIS

A024370

a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = A023532, t = (composite numbers).

%I #4 Mar 30 2012 18:55:54

%S 4,6,8,9,18,21,33,37,42,47,63,69,89,96,117,126,135,142,168,178,207,

%T 217,248,259,294,307,319,332,370,385,427,443,484,503,550,568,617,636,

%U 656,675,726,747,803,825,882,906,965,991,1054,1079,1144,1172,1201,1230,1298,1324

%N a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = A023532, t = (composite numbers).

%K nonn

%O 1,1

%A _Clark Kimberling_