Primes having only {0, 6, 7} as digits.

Terms

a(0) =7a(1) =67a(2) =607a(3) =677a(4) =6007a(5) =6067a(6) =6607a(7) =7607a(8) =60077a(9) =60607a(10) =66067a(11) =67607a(12) =67777a(13) =70067a(14) =70607a(15) =70667a(16) =76607a(17) =76667a(18) =76777a(19) =606077a(20) =606607a(21) =607007a(22) =607067a(23) =607667a(24) =660067a(25) =660607a(26) =666067a(27) =666607a(28) =666667a(29) =666707