a(1)=0, a(n+1) is the smallest nonprime >= n^smallest digit of a(n).

Terms

a(0) =0a(1) =1a(2) =4a(3) =81a(4) =4a(5) =625a(6) =36a(7) =343a(8) =512a(9) =9a(10) =1000000000a(11) =1a(12) =12a(13) =14a(14) =14a(15) =15a(16) =16a(17) =18a(18) =18a(19) =20a(20) =1a(21) =21a(22) =22a(23) =529a(24) =576a(25) =9765625a(26) =676a(27) =387420489a(28) =1a(29) =30