a(n) = s(1)*t(n) + s(2)*t(n-1) + ... + s(k)*t(n+1-k), where k = floor((n+1)/2), s = A023531, t = (composite numbers).

A024321

a(n) = s(1)*t(n) + s(2)*t(n-1) + ... + s(k)*t(n+1-k), where k = floor((n+1)/2), s = A023531, t = (composite numbers).

Terms

    a(0) =0a(1) =0a(2) =6a(3) =8a(4) =9a(5) =10a(6) =12a(7) =14a(8) =25a(9) =28a(10) =32a(11) =35a(12) =37a(13) =40a(14) =44a(15) =46a(16) =64a(17) =69a(18) =73a(19) =77a(20) =81a(21) =85a(22) =89a(23) =93a(24) =96a(25) =100a(26) =128a(27) =133a(28) =139a(29) =144

External references