(Sum of composites among next n numbers)-(sum of primes among next n numbers).

Terms

a(0) =0a(1) =-5a(2) =5a(3) =20a(4) =17a(5) =39a(6) =129a(7) =140a(8) =127a(9) =305a(10) =431a(11) =448a(12) =603a(13) =777a(14) =1037a(15) =1540a(16) =1313a(17) =1951a(18) =2373a(19) =2450a(20) =2861a(21) =3407a(22) =3975a(23) =4656a(24) =5329a(25) =6073a(26) =6951a(27) =7092a(28) =7983a(29) =8091