Near-repdigit primes with 7 as repeated digit.

Terms

a(0) =277a(1) =577a(2) =677a(3) =727a(4) =757a(5) =773a(6) =787a(7) =797a(8) =877a(9) =977a(10) =1777a(11) =2777a(12) =7177a(13) =7477a(14) =7577a(15) =7717a(16) =7727a(17) =7757a(18) =7877a(19) =47777a(20) =67777a(21) =71777a(22) =76777a(23) =77377a(24) =77477a(25) =77747a(26) =77773a(27) =77797a(28) =77977a(29) =79777