Numbers in which every prefix (in base 10) is 1 or a prime.

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =7a(5) =11a(6) =13a(7) =17a(8) =19a(9) =23a(10) =29a(11) =31a(12) =37a(13) =53a(14) =59a(15) =71a(16) =73a(17) =79a(18) =113a(19) =131a(20) =137a(21) =139a(22) =173a(23) =179a(24) =191a(25) =193a(26) =197a(27) =199a(28) =233a(29) =239