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 A263562 #14 Apr 03 2023 10:36:13
%S A263562 1865978047,1889699677,2362339121,3637126963,11776639499,19321614419,
%T A263562 20000692169,20111311169,20592473107,20597584901,21477425107,
%U A263562 23368396573,23479945327,25326720611,26161244323,27190405961,27380064223,27474950743,31467088979
%N A263562 Primes p such that for every k >= 1, p*2^k - 1 has a divisor in the set {3, 5, 13, 17, 97, 241, 257}.
%C A263562 What is the smallest term of this sequence that belongs to A180247? Is it the smallest prime Brier number?
%H A263562 Chris Caldwell, The Prime Glossary, <a href="https://t5k.org/glossary/xpage/RieselNumber.html">Riesel number</a>
%H A263562 Carlos Rivera, <a href="http://www.primepuzzles.net/problems/prob_052.htm">Problem 52</a>
%Y A263562 Cf. A101036, A180247, A263560.
%Y A263562 Subsequence of A263561.
%K A263562 nonn
%O A263562 1,1
%A A263562 _Arkadiusz Wesolowski_, Oct 21 2015