a(n) = n-th prime * n-th nonprime.

Terms

a(0) =2a(1) =12a(2) =30a(3) =56a(4) =99a(5) =130a(6) =204a(7) =266a(8) =345a(9) =464a(10) =558a(11) =740a(12) =861a(13) =946a(14) =1128a(15) =1325a(16) =1534a(17) =1647a(18) =1876a(19) =2130a(20) =2336a(21) =2607a(22) =2822a(23) =3115a(24) =3492a(25) =3838a(26) =4017a(27) =4280a(28) =4578a(29) =4972