Smallest prime q of form q=-1+(c+1)*10^w, where c runs through composites not divisible by 3.

Terms

a(0) =499a(1) =89a(2) =109a(3) =149a(4) =1699a(5) =2099a(6) =229a(7) =25999a(8) =269a(9) =289999a(10) =3299a(11) =349a(12) =359a(13) =389a(14) =409a(15) =449a(17) =499a(18) =509a(19) =52999a(20) =5599999a(21) =569a(23) =6299a(25) =659a(26) =6899a(27) =709a(28) =7499a(29) =769a(30) =77999a(31) =809a(32) =829