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 A108331 #25 Jul 27 2021 05:02:55 %S A108331 2,1800,2368,15328 %N A108331 Integers k such that 10^k - 87 is prime. %C A108331 See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "99913". %C A108331 a(5) > 10^5. - _Tyler NeSmith_, Jul 26 2021 %H A108331 Makoto Kamada, <a href="https://stdkmd.net/nrr/prime/">List of near-repdigit-related prime numbers</a>. %H A108331 <a href="/index/Pri#Pri_rep">Index entries for primes involving repunits</a>. %e A108331 k = 2 is a term because 10^2 - 87 = 100 - 87 = 13, which is prime. %Y A108331 Cf. A089675, A095714, A092767. %K A108331 more,nonn %O A108331 1,1 %A A108331 Julien Peter Benney (jpbenney(AT)ftml.net), Jun 30 2005 %E A108331 a(4) from Kamada data by _Robert Price_, Dec 13 2010 %E A108331 Edited by _Ray Chandler_, Dec 23 2010