a(n) = n * Sum_{k prime<=n} k.

Terms

a(0) =0a(1) =4a(2) =15a(3) =20a(4) =50a(5) =60a(6) =119a(7) =136a(8) =153a(9) =170a(10) =308a(11) =336a(12) =533a(13) =574a(14) =615a(15) =656a(16) =986a(17) =1044a(18) =1463a(19) =1540a(20) =1617a(21) =1694a(22) =2300a(23) =2400a(24) =2500a(25) =2600a(26) =2700a(27) =2800a(28) =3741a(29) =3870