Right-truncatable semiprimes.

Terms

a(0) =4a(1) =6a(2) =9a(3) =46a(4) =49a(5) =62a(6) =65a(7) =69a(8) =91a(9) =93a(10) =94a(11) =95a(12) =466a(13) =469a(14) =493a(15) =497a(16) =622a(17) =623a(18) =626a(19) =629a(20) =655a(21) =694a(22) =695a(23) =697a(24) =698a(25) =699a(26) =913a(27) =914a(28) =917a(29) =933