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

Terms

a(0) =3a(1) =13a(2) =47a(3) =107a(4) =257a(5) =397a(6) =653a(7) =881a(8) =1279a(9) =1889a(10) =2293a(11) =3119a(12) =3847a(13) =4423a(14) =5323a(15) =6563a(16) =7937a(17) =8819a(18) =10391a(19) =11833a(20) =12889a(21) =14831a(22) =16477a(23) =18713a(24) =21599a(25) =23603a(26) =25189a(27) =27409a(28) =29063a(29) =31511