Least number beginning with n such that every concatenation is a prime.

Terms

a(0) =11a(1) =23a(2) =31a(3) =419a(4) =523a(5) =63a(6) =741a(7) =81a(8) =933a(9) =1077a(10) =117a(11) =1257a(12) =137a(13) =1441a(14) =1523a(15) =16111a(16) =1731a(17) =1829a(18) =1977a(19) =20091a(20) =21151a(21) =221a(22) =23059a(23) =24059a(24) =2569a(25) =2621a(26) =2769a(27) =2883a(28) =2913a(29) =3087