This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A260128 #20 Jul 21 2025 00:45:38
%S A260128 2,3,23,29,223,229,233,239,293,929,2239,2293,2333,2339,2393,2399,2939,
%T A260128 2999,3229,3299,3323,3329,3923,3929,9239,9293,9323,9923,9929,22229,
%U A260128 22993,23293,23333,23339,23399,23929,23993,29333,29339,29399,32233,32299,32323
%N A260128 Primes having only {2, 3, 9} as digits.
%C A260128 A020458 and A020460 are subsequences.
%H A260128 Alois P. Heinz, <a href="/A260128/b260128.txt">Table of n, a(n) for n = 1..10000</a>
%H A260128 <a href="/index/Pri#PrimesWithDigits">Index to entries for primes with digits in a given set</a>
%t A260128 Select[Prime[Range[4 10^3]], Complement[IntegerDigits[#], {2, 3, 9}]=={} &]
%t A260128 Select[FromDigits/@Flatten[Table[Tuples[{2,3,9},n],{n,5}],1],PrimeQ] (* _Harvey P. Dale_, Apr 15 2025 *)
%o A260128 (Magma) [p: p in PrimesUpTo(300000) | Set(Intseq(p)) subset [2, 3, 9]];
%Y A260128 Cf. similar sequences listed in A260125.
%Y A260128 Cf. A020458, A020460.
%K A260128 nonn,easy,base
%O A260128 1,1
%A A260128 _Vincenzo Librandi_, Jul 17 2015