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 A261268 #9 Jul 20 2025 19:32:01
%S A261268 2,29,229,929,2029,2099,2909,2999,9029,9209,9929,20029,20929,22229,
%T A261268 29009,29209,92009,99929,200009,200029,200909,200929,202099,202999,
%U A261268 209029,209299,209929,220009,222029,290209,290999,292909,299029,299099,299909,900929
%N A261268 Primes having only {0, 2, 9} as digits.
%C A261268 A020460 is a subsequence.
%H A261268 Alois P. Heinz, <a href="/A261268/b261268.txt">Table of n, a(n) for n = 1..10000</a>
%H A261268 <a href="/index/Pri#PrimesWithDigits">Index to entries for primes with digits in a given set</a>
%t A261268 Select[Prime[Range[2 10^5]], Complement[IntegerDigits[#], {0, 2, 9}] == {} &]
%o A261268 (Magma) [p: p in PrimesUpTo(2*10^6) | Set(Intseq(p)) subset [0, 2, 9]];
%Y A261268 Cf. similar sequences listed in A261267.
%Y A261268 Cf. A000040, A020460.
%K A261268 nonn,easy,base
%O A261268 1,1
%A A261268 _Vincenzo Librandi_, Aug 18 2015