Dropping any digit gives a prime number.

Terms

a(0) =22a(1) =23a(2) =25a(3) =27a(4) =32a(5) =33a(6) =35a(7) =37a(8) =52a(9) =53a(10) =55a(11) =57a(12) =72a(13) =73a(14) =75a(15) =77a(16) =111a(17) =113a(18) =117a(19) =119a(20) =131a(21) =137a(22) =171a(23) =173a(24) =179a(25) =197a(26) =311a(27) =317a(28) =371a(29) =411