a(1) = 1; a(n) = smallest multiple of n-th prime (n>1) with all odd digits.

Terms

a(0) =1a(1) =3a(2) =5a(3) =7a(4) =11a(5) =13a(6) =17a(7) =19a(8) =115a(9) =319a(10) =31a(11) =37a(12) =533a(13) =559a(14) =517a(15) =53a(16) =59a(17) =793a(18) =335a(19) =71a(20) =73a(21) =79a(22) =913a(23) =979a(24) =97a(25) =1111a(26) =515a(27) =535a(28) =1199a(29) =113