Primes having only {0, 5, 6, 7} as digits.

Terms

a(0) =5a(1) =7a(2) =67a(3) =557a(4) =577a(5) =607a(6) =677a(7) =757a(8) =5077a(9) =5507a(10) =5557a(11) =5657a(12) =6007a(13) =6067a(14) =6577a(15) =6607a(16) =7057a(17) =7507a(18) =7577a(19) =7607a(20) =7757a(21) =50077a(22) =50707a(23) =50767a(24) =50777a(25) =55057a(26) =55667a(27) =56767a(28) =57077a(29) =57557