a(1)=2, a(n+1) is the smallest prime > n^smallest digit of a(n).

Terms

a(0) =2a(1) =2a(2) =5a(3) =251a(4) =5a(5) =3137a(6) =7a(7) =823547a(8) =67a(9) =531457a(10) =11a(11) =13a(12) =13a(13) =17a(14) =17a(15) =17a(16) =17a(17) =19a(18) =19a(19) =23a(20) =401a(21) =2a(22) =487a(23) =279847a(24) =577a(25) =9765629a(26) =677a(27) =387420499a(28) =2a(29) =853