Primes p such that one digit appears exactly six times together with a single different digit.

Terms

a(0) =1111151a(1) =1111181a(2) =1111211a(3) =1111711a(4) =1114111a(5) =1117111a(6) =1171111a(7) =2999999a(8) =3233333a(9) =3331333a(10) =3333133a(11) =3333233a(12) =3333313a(13) =3333331a(14) =3333373a(15) =3333383a(16) =3333433a(17) =3337333a(18) =3353333a(19) =3433333a(20) =3733333a(21) =4999999a(22) =7477777a(23) =7577777a(24) =7727777a(25) =7772777a(26) =7774777a(27) =7777727a(28) =7778777a(29) =7877777