Primes that contain only the digits (2, 3, 7).

Terms

a(0) =2a(1) =3a(2) =7a(3) =23a(4) =37a(5) =73a(6) =223a(7) =227a(8) =233a(9) =277a(10) =337a(11) =373a(12) =727a(13) =733a(14) =773a(15) =2237a(16) =2273a(17) =2333a(18) =2377a(19) =2777a(20) =3323a(21) =3373a(22) =3727a(23) =3733a(24) =7237a(25) =7333a(26) =7723a(27) =7727a(28) =22273a(29) =22277