S[A002808(n)] where S[] is Boris Stechkin's function (A055004) and A002808(n) are the composites.

Terms

a(0) =0a(1) =0a(2) =15a(3) =64a(4) =171a(5) =252a(6) =359a(7) =656a(8) =1079a(9) =1346a(10) =1656a(11) =2415a(12) =3373a(13) =3927a(14) =4550a(15) =5993a(16) =6793a(17) =7690a(18) =8653a(19) =9697a(20) =12028a(21) =14695a(22) =16158a(23) =17731a(24) =19398a(25) =21174a(26) =25017a(27) =27108a(28) =29318a(29) =34077