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 A077315 #9 Feb 23 2020 21:20:18
%S A077315 3,7,31,43,127,241,967,5323,8191,117127,131071,524287,7496191,
%T A077315 10307263,77948683,253755391,428717761,738197503,1714871047,
%U A077315 2147483647,16240345087,27437936767,42218553343,1965081755647,2414538435583,7024111812607,7860327022591,16630113370111
%N A077315 Primes of the form 2^r * 11^s - 1.
%H A077315 Jinyuan Wang, <a href="/A077315/b077315.txt">Table of n, a(n) for n = 1..910</a>
%o A077315 (PARI) lista(nn) = {my(q=1/2, p, w=List([])); for(r=0, logint(nn, 2), q=2*q; p=q/11; for(s=0, logint(nn\q, 11), p=11*p; if(ispseudoprime(p-1), listput(w, p-1)))); Set(w); } \\ _Jinyuan Wang_, Feb 23 2020
%Y A077315 Cf. A023509, A077313, A077314, A173062.
%K A077315 nonn
%O A077315 1,1
%A A077315 _Amarnath Murthy_, Nov 04 2002
%E A077315 More terms from _Ray Chandler_, Aug 02 2003
%E A077315 a(26)-a(28) from _Jinyuan Wang_, Feb 23 2020