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

Terms

a(0) =1a(1) =7a(2) =28a(3) =61a(4) =144a(5) =233a(6) =396a(7) =517a(8) =724a(9) =1061a(10) =1366a(11) =1847a(12) =2286a(13) =2631a(14) =3118a(15) =3803a(16) =4650a(17) =5033a(18) =6222a(19) =6989a(20) =7634a(21) =8743a(22) =9830a(23) =10975a(24) =12628a(25) =14121a(26) =15098a(27) =16329a(28) =17262a(29) =18397