Primes having only {0, 2, 6, 7} as digits.

Terms

a(0) =2a(1) =7a(2) =67a(3) =227a(4) =277a(5) =607a(6) =677a(7) =727a(8) =2027a(9) =2207a(10) =2267a(11) =2677a(12) =2707a(13) =2767a(14) =2777a(15) =6007a(16) =6067a(17) =6277a(18) =6607a(19) =7027a(20) =7207a(21) =7607a(22) =7727a(23) =20627a(24) =20707a(25) =22027a(26) =22067a(27) =22277a(28) =22727a(29) =22777