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 A108365 #32 Jan 25 2022 08:36:38 %S A108365 2,5,6,12,17,19,61,102,195,447,1250,1329,1935,3930,5837,7176,8724, %T A108365 20881,23936,61868,91920 %N A108365 Integers k such that 10^k - 39 is prime. %C A108365 The next term, if one exists, is > 100000. - _Robert Price_, Apr 25 2011 %C A108365 See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "99961". %H A108365 Makoto Kamada, <a href="https://stdkmd.net/nrr/prime/">List of near-repdigit-related prime numbers</a>. %H A108365 <a href="/index/Pri#Pri_rep">Index entries for primes involving repunits</a>. %e A108365 k=2 is a term because 10^2 - 39 = 61 (prime). %e A108365 k=61 is a term because 10^61 - 39 = 9999999999999999999999999999999999999999999999999999999999961 (prime). %Y A108365 Cf. A108330, A108328. %K A108365 nonn,more %O A108365 1,1 %A A108365 _Parthasarathy Nambi_, Jul 01 2005 %E A108365 a(8)-a(12) from _Stefan Steinerberger_, Nov 05 2005 %E A108365 a(13)-a(19) from _Robert Price_, Dec 12 2010 %E A108365 Edited by _Ray Chandler_, Dec 23 2010 %E A108365 a(20)-a(21) from _Robert Price_, Apr 25 2011