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 A206001 #34 Jan 26 2023 11:39:49
%S A206001 271129,78557,1777613,169073869
%N A206001 Least k such that k*2^m + 1 has a covering set with precisely n primes.
%C A206001 a(10) > 2^31. a(11) = 1143502909. - _Arkadiusz Wesolowski_, Apr 29 2012
%H A206001 Wikipedia, <a href="http://en.wikipedia.org/wiki/Covering_set">Covering set</a>
%H A206001 Wikipedia, <a href="http://en.wikipedia.org/wiki/Sierpinski_number">Sierpinski number</a>
%e A206001 271129 has the covering set {3, 5, 7, 13, 17, 241}.
%e A206001 78557 has the covering set {3, 5, 7, 13, 19, 37, 73}.
%e A206001 1777613 has the covering set {3, 5, 7, 13, 17, 19, 109, 433}.
%e A206001 169073869 has the covering set {3, 5, 7, 11, 13, 41, 61, 151, 331}.
%Y A206001 Cf. A076336.
%K A206001 more,nonn
%O A206001 6,1
%A A206001 _Arkadiusz Wesolowski_, Feb 10 2012