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 A079907 #18 Sep 08 2022 08:45:08
%S A079907 1,2,21,25,33,54,78,235,1566,2273,2310,4121,7775,42249,105974,138961
%N A079907 Numbers n such that 11*12^n -1 is prime.
%C A079907 a(17) > 2*10^5. - _Robert Price_, Mar 20 2015
%D A079907 R. K. Guy, Unsolved Problems in Theory of Numbers, Section A3.
%H A079907 Steven Harvey, <a href="http://harvey563.tripod.com/wills.txt">Williams Primes</a>
%H A079907 H. C. Williams, <a href="http://matwbn.icm.edu.pl/ksiazki/aa/aa39/aa3912.pdf">The primality of certain integers of the form 2Ar^n - 1</a>, Acta Arith. 39 (1981), 7-17.
%t A079907 Do[ If[ PrimeQ[11*12^n - 1], Print[n]], {n, 1, 2000}]
%t A079907 Select[Range[10000], PrimeQ[(11 12^# - 1)] &] (* _Vincenzo Librandi_, Mar 21 2015 *)
%o A079907 (PARI) for(n=1,2000, if(isprime(11*12^n-1),print1(n, ", ")))
%o A079907 (Magma) [n: n in [1..600]| IsPrime(11*12^n - 1)]; // _Vincenzo Librandi_, Mar 21 2015
%Y A079907 Cf. A003307, A002235, A046865, A079906, A046866, A001771, A005541, A056725, A046867.
%K A079907 nonn,hard
%O A079907 1,2
%A A079907 _Robert G. Wilson v_, Jan 16 2003
%E A079907 More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 05 2008
%E A079907 a(13)-a(16) from _Robert Price_, Mar 20 2015