Primes whose pattern of identical digits is unique among the primes.

Terms

a(0) =11a(1) =3333311a(2) =7771717a(3) =11818181a(4) =515115551a(5) =727722727a(6) =887887787a(7) =1110011101a(8) =1161611161a(9) =1411111441a(10) =1411141411a(11) =1717117117a(12) =1911999919a(13) =3311113111a(14) =3313133311a(15) =3333353533a(16) =5151111551a(17) =5555115151a(18) =5777777557a(19) =7373733337a(20) =7747447777a(21) =7777111777a(22) =8887788787a(23) =9199119991a(24) =9994449499