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 = (primes).

A024604

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 = (primes).

Terms

    a(0) =8a(1) =12a(2) =38a(3) =58a(4) =126a(5) =174a(6) =297a(7) =381a(8) =569a(9) =689a(10) =979a(11) =1167a(12) =1591a(13) =1825a(14) =2372a(15) =2700a(16) =3408a(17) =3814a(18) =4716a(19) =5166a(20) =6274a(21) =6856a(22) =8175a(23) =8811a(24) =10375a(25) =11141a(26) =12989a(27) =13909a(28) =16008a(29) =17042

External references