a(1) = 1, then least square such that every partial concatenation is a prime.

Terms

a(0) =1a(1) =1a(2) =81a(3) =729a(4) =441a(5) =729a(6) =81a(7) =1521a(8) =59049a(9) =1521a(10) =9a(11) =13689a(12) =1089a(13) =159201a(14) =62001a(15) =363609a(16) =4761a(17) =1521a(18) =8649a(19) =1147041a(20) =110889a(21) =29241a(22) =233289a(23) =370881a(24) =558009a(25) =7569a(26) =710649a(27) =59049a(28) =184041a(29) =301401