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

A024590

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

Terms

    a(0) =4a(1) =12a(2) =38a(3) =58a(4) =118a(5) =154a(6) =253a(7) =307a(8) =451a(9) =525a(10) =731a(11) =829a(12) =1109a(13) =1235a(14) =1586a(15) =1742a(16) =2170a(17) =2358a(18) =2888a(19) =3112a(20) =3756a(21) =4020a(22) =4767a(23) =5073a(24) =5929a(25) =6279a(26) =7277a(27) =7675a(28) =8798a(29) =9246

External references