Semiprimes for which dropping any digit gives a prime number.

Terms

a(0) =22a(1) =25a(2) =33a(3) =35a(4) =55a(5) =57a(6) =77a(7) =111a(8) =119a(9) =371a(10) =411a(11) =413a(12) =417a(13) =437a(14) =471a(15) =473a(16) =611a(17) =671a(18) =713a(19) =731a(20) =1037a(21) =1073a(22) =1079a(23) =1379a(24) =1397a(25) =1673a(26) =1739a(27) =1937a(28) =1991a(29) =2571