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 A260831 #19 Jul 20 2025 17:40:36
%S A260831 5,7,59,79,97,557,577,599,757,797,977,997,5557,5779,7559,7577,7757,
%T A260831 7759,55579,55799,55997,57557,57559,57977,59557,59779,59797,59957,
%U A260831 59999,75557,75577,75797,75979,75997,77557,77797,77977,77999,79559,79579,79757,79777
%N A260831 Primes having only {5, 7, 9} as digits.
%C A260831 A020467, A020468 and A020471 are subsequences.
%C A260831 Subsequence of A030096.
%H A260831 Alois P. Heinz, <a href="/A260831/b260831.txt">Table of n, a(n) for n = 1..10000</a>
%H A260831 James Maynard and Brady Haran, <a href="https://www.youtube.com/watch?v=eeoBCS7IEqs">Primes without a 7</a>, Numberphile video (2019)
%H A260831 <a href="/index/Pri#PrimesWithDigits">Index to entries for primes with digits in a given set</a>
%t A260831 Select[Prime[Range[2 10^5]], Complement[IntegerDigits[#], {5, 7, 9}] == {} &]
%o A260831 (Magma) [p: p in PrimesUpTo(2*10^5) | Set(Intseq(p)) subset [5, 7, 9]];
%Y A260831 Cf. similar sequences listed in A260827.
%Y A260831 Cf. A000040, A020467, A020468, A020471, A030096.
%K A260831 nonn,easy,base
%O A260831 1,1
%A A260831 _Vincenzo Librandi_, Aug 03 2015