a(n) = (prime(n))^2 - (nonprime(n))^2.

Terms

a(0) =4a(1) =8a(2) =9a(3) =13a(4) =57a(5) =88a(6) =189a(7) =217a(8) =333a(9) =616a(10) =705a(11) =1045a(12) =1281a(13) =1408a(14) =1725a(15) =2233a(16) =2856a(17) =3045a(18) =3760a(19) =4257a(20) =4429a(21) =5217a(22) =5800a(23) =6765a(24) =8184a(25) =8905a(26) =9165a(27) =9928a(28) =10281a(29) =11005