Composite and every divisor (except 1) contains the digit 3.

Terms

a(0) =39a(1) =93a(2) =309a(3) =339a(4) =393a(5) =403a(6) =713a(7) =933a(8) =939a(9) =993a(10) =1137a(11) =1293a(12) =1317a(13) =1329a(14) =1333a(15) =1339a(16) =1369a(17) =1389a(18) =1643a(19) =1703a(20) =1839a(21) =1893a(22) =2263a(23) =2319a(24) =2369a(25) =2573a(26) =3013a(27) =3029a(28) =3039a(29) =3071