Sum_{j=k(n)..prime(n)} j where k is the n-th nonprime nonnegative integer.

Terms

a(0) =3a(1) =6a(2) =9a(3) =13a(4) =38a(5) =55a(6) =108a(7) =124a(8) =185a(9) =330a(10) =376a(11) =550a(12) =671a(13) =736a(14) =897a(15) =1155a(16) =1470a(17) =1566a(18) =1927a(19) =2178a(20) =2266a(21) =2664a(22) =2958a(23) =3444a(24) =4158a(25) =4521a(26) =4653a(27) =5037a(28) =5215a(29) =5580