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 A261183 #14 Jul 20 2025 17:40:10
%S A261183 7,47,79,97,449,479,499,797,947,977,997,4447,4799,4999,7477,7499,7949,
%T A261183 9479,9497,9749,9949,44449,44497,44777,44797,47497,47777,47779,47797,
%U A261183 47947,47977,49477,49499,49747,49999,74449,74747,74779,74797,77447,77477,77479
%N A261183 Primes having only {4, 7, 9} as digits.
%C A261183 A020465, A020466 and A020471 are subsequences.
%H A261183 Alois P. Heinz, <a href="/A261183/b261183.txt">Table of n, a(n) for n = 1..20000</a>
%H A261183 James Maynard and Brady Haran, <a href="https://www.youtube.com/watch?v=eeoBCS7IEqs">Primes without a 7</a>, Numberphile video (2019)
%H A261183 <a href="/index/Pri#PrimesWithDigits">Index to entries for primes with digits in a given set</a>
%t A261183 Select[Prime[Range[6 10^4]], Complement[IntegerDigits[#], {4, 7, 9}] == {} &]
%o A261183 (Magma) [p: p in PrimesUpTo(2*10^5) | Set(Intseq(p)) subset [4, 7, 9]];
%Y A261183 Cf. similar sequences listed in A261181.
%Y A261183 Cf. A000040, A020465, A020466, A020471.
%K A261183 nonn,easy,base
%O A261183 1,1
%A A261183 _Vincenzo Librandi_, Aug 11 2015