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 A261184 #14 Jul 20 2025 17:37:20
%S A261184 7,67,79,97,677,769,797,967,977,997,6679,6779,6967,6977,6997,7669,
%T A261184 7699,9677,9679,9697,9767,9769,9967,66697,66797,66977,67679,67699,
%U A261184 67777,67967,67979,69677,69697,69767,69779,69997,76667,76679,76697,76777,77699,77797
%N A261184 Primes having only {6, 7, 9} as digits.
%C A261184 A020469 and A020471 are subsequences.
%H A261184 Alois P. Heinz, <a href="/A261184/b261184.txt">Table of n, a(n) for n = 1..10000</a>
%H A261184 James Maynard and Brady Haran, <a href="https://www.youtube.com/watch?v=eeoBCS7IEqs">Primes without a 7</a>, Numberphile video (2019)
%H A261184 <a href="/index/Pri#PrimesWithDigits">Index to entries for primes with digits in a given set</a>
%t A261184 Select[Prime[Range[6 10^4]], Complement[IntegerDigits[#], {6, 7, 9}] == {} &]
%t A261184 Select[Flatten[Table[FromDigits/@Tuples[{6,7,9},n],{n,5}]],PrimeQ] (* _Harvey P. Dale_, Jun 18 2021 *)
%o A261184 (Magma) [p: p in PrimesUpTo(2*10^5) | Set(Intseq(p)) subset [6, 7, 9]];
%Y A261184 Cf. similar sequences listed in A261181.
%Y A261184 Cf. A000040, A020469, A020471.
%K A261184 nonn,easy,base
%O A261184 1,1
%A A261184 _Vincenzo Librandi_, Aug 11 2015