A025100 - OEIS

A025100

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

%I #3 Mar 30 2012 18:56:01

%S 6,8,25,28,59,68,129,148,249,277,454,491,728,790,1131,1225,1650,1759,

%T 2313,2436,3173,3338,4197,4414,5495,5732,7003,7304,8737,9108,10767,

%U 11219,13172,13718,15997,16588,19089,19714,22566,23296,26463,27301,30722,31686,35514

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

%K nonn

%O 1,1

%A _Clark Kimberling_