Primes having only {3, 6, 7} as digits.

Terms

a(0) =3a(1) =7a(2) =37a(3) =67a(4) =73a(5) =337a(6) =367a(7) =373a(8) =673a(9) =677a(10) =733a(11) =773a(12) =3373a(13) =3637a(14) =3673a(15) =3677a(16) =3733a(17) =3767a(18) =6337a(19) =6367a(20) =6373a(21) =6637a(22) =6673a(23) =6733a(24) =6737a(25) =6763a(26) =7333a(27) =7673a(28) =33377a(29) =33637