Odd composite numbers such that the sum of any two terms, plus 1, is composite.

Terms

a(0) =9a(1) =15a(2) =35a(3) =39a(4) =75a(5) =119a(6) =125a(7) =209a(8) =249a(9) =279a(10) =285a(11) =287a(12) =435a(13) =545a(14) =749a(15) =779a(16) =825a(17) =939a(18) =1065a(19) =1469a(20) =1505a(21) =1635a(22) =1655a(23) =2525a(24) =3107a(25) =3339a(26) =3689a(27) =3705a(28) =3999a(29) =4569