Smallest prime with digit sum n, or 0 if no such prime exists.

Terms

a(0) =0a(1) =2a(2) =3a(3) =13a(4) =5a(5) =0a(6) =7a(7) =17a(8) =0a(9) =19a(10) =29a(11) =0a(12) =67a(13) =59a(14) =0a(15) =79a(16) =89a(17) =0a(18) =199a(19) =389a(20) =0a(21) =499a(22) =599a(23) =0a(24) =997a(25) =1889a(26) =0a(27) =1999a(28) =2999a(29) =0