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 A260271 #9 Jul 14 2025 17:32:51
%S A260271 11,19,41,149,191,199,419,449,491,499,911,919,941,991,1499,1949,1999,
%T A260271 4111,4441,4919,4999,9199,9419,9491,9941,9949,11119,11149,11411,11491,
%U A260271 11941,14149,14411,14419,14449,19141,19441,19919,19949,19991,41141,41149,41411
%N A260271 Primes having only {1, 4, 9} as digits.
%C A260271 A020452, A020457 and A020466 are subsequences.
%H A260271 Alois P. Heinz, <a href="/A260271/b260271.txt">Table of n, a(n) for n = 1..10000</a>
%t A260271 Select[Prime[Range[5 10^3]], Complement[IntegerDigits[#], {1, 4, 9}]=={} &]
%o A260271 (Magma) [p: p in PrimesUpTo(5*10^4) | Set(Intseq(p)) subset [1, 4, 9]];
%Y A260271 Cf. similar sequences listed in A260266.
%Y A260271 Cf. A020452, A020457, A020466.
%K A260271 nonn,easy,base
%O A260271 1,1
%A A260271 _Vincenzo Librandi_, Jul 23 2015