Becomes prime after exactly 6 iterations of f(x) = sum of prime factors of x.

Terms

a(0) =393a(1) =889a(2) =1142a(3) =1179a(4) =1257a(5) =1270a(6) =1285a(7) =1315a(8) =1389a(9) =1502a(10) =1542a(11) =1563a(12) =1578a(13) =1838a(14) =2217a(15) =2284a(16) =2305a(17) =2326a(18) =2474a(19) =2540a(20) =2761a(21) =2766a(22) =2787a(23) =2827a(24) =2913a(25) =3004a(26) =3084a(27) =3156a(28) =3193a(29) =3207