Primes having only {0, 4, 6, 7} as digits.

Terms

a(0) =7a(1) =47a(2) =67a(3) =467a(4) =607a(5) =647a(6) =677a(7) =4007a(8) =4447a(9) =6007a(10) =6047a(11) =6067a(12) =6607a(13) =7477a(14) =7607a(15) =44647a(16) =44777a(17) =46447a(18) =46477a(19) =46747a(20) =47407a(21) =47777a(22) =60077a(23) =60607a(24) =60647a(25) =64007a(26) =64067a(27) =64667a(28) =64747a(29) =66047