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 A128472 #14 Jun 07 2021 01:12:20
%S A128472 0,79,6103515623,5764799,31381059607
%N A128472 a(n) is the smallest prime of the form (2n-1)^k - 2 for k > (2n-1), or 0 if no such number exists.
%C A128472 a(6) = 11^22420 - 2 was found by _Rick L. Shepherd_ on Sep 29 2007. It has 23349 decimal digits and it is too large to include.
%C A128472 a(7) through a(12): {771936328432730777189183517369830159827426282764863750131729657829597399846468418688727, 98526125335693359373, 339448671314611904643504117119, 37589973457545958193355599, 1136272165922724266740722458520499, 480250763996501976790165756943039}.
%H A128472 Henri Lifchitz and Renaud Lifchitz: <a href="http://www.primenumbers.net/prptop/prptop.php">PRP Records. Probable Primes Top 10000</a>.
%Y A128472 Cf. A084714 (smallest prime of the form (2n-1)^k - 2).
%Y A128472 Cf. A133856 (least number k > (2n-1) such that (2n-1)^k - 2 is prime).
%Y A128472 Cf. A014224, A109080, A090669, A128455, A128457, A128458, A128459, A128460, A128461.
%Y A128472 Cf. A133858, A133982.
%K A128472 nonn
%O A128472 1,2
%A A128472 _Alexander Adamchuk_, Mar 14 2007, Oct 01 2007
%E A128472 Edited by _Max Alekseyev_, Sep 18 2009