Interprimes which are of the form s*prime, s=3.

Terms

a(0) =6a(1) =9a(2) =15a(3) =21a(4) =39a(5) =69a(6) =93a(7) =111a(8) =129a(9) =309a(10) =381a(11) =393a(12) =453a(13) =489a(14) =501a(15) =687a(16) =723a(17) =771a(18) =879a(19) =933a(20) =939a(21) =1011a(22) =1167a(23) =1299a(24) =1527a(25) =1563a(26) =1569a(27) =1839a(28) =1941a(29) =1983