Least multiple of n such that every partial concatenation followed by a 9 is prime.

Terms

a(0) =1a(1) =4a(2) =3a(3) =8a(4) =10a(5) =30a(6) =84a(7) =56a(8) =18a(9) =100a(10) =198a(11) =108a(12) =351a(13) =42a(14) =375a(15) =128a(16) =136a(17) =450a(18) =551a(19) =600a(20) =966a(21) =66a(22) =552a(23) =336a(24) =2125a(25) =780a(26) =594a(27) =2576a(28) =348a(29) =2520