Nonprime; becomes prime if any digit is deleted (zeros not allowed in the number).

Terms

a(0) =22a(1) =25a(2) =27a(3) =32a(4) =33a(5) =35a(6) =52a(7) =55a(8) =57a(9) =72a(10) =75a(11) =77a(12) =111a(13) =117a(14) =119a(15) =171a(16) =371a(17) =411a(18) =413a(19) =417a(20) =437a(21) =471a(22) =473a(23) =611a(24) =671a(25) =711a(26) =713a(27) =731a(28) =1379a(29) =1397