%I #12 Sep 08 2022 08:44:45
%S 3,43,433,443,3343,3433,33343,333433,334333,343333,343433,444343,
%T 444443,3333433,3343343,3343433,3344333,3344443,3433333,3434443,
%U 3443443,3444443,4344443,4433333,4434343,4443433,34333333,34434343,34444343,43444433
%N Primes that contain digits 3 and 4 only.
%H Vincenzo Librandi, <a href="/A020461/b020461.txt">Table of n, a(n) for n = 1..1000</a>
%t Flatten[Table[Select[FromDigits/@Tuples[{3,4},n],PrimeQ],{n,8}]] (* _Vincenzo Librandi_, Jul 27 2012 *)
%o (Magma) [p: p in PrimesUpTo(43444433) | Set(Intseq(p)) subset [3,4]];
%o // _Bruno Berselli_, Jul 27 2012
%Y Cf. A054356.
%K nonn,base
%O 1,1
%A _David W. Wilson_