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 A135117 #22 Jan 25 2022 08:46:17 %S A135117 1,3,9,19,39,43,121,153,1243,14445,15273,26779 %N A135117 Integers k such that 10^k + 87 is a prime number. %C A135117 The next term, if one exists, is > 100000. - _Robert Price_, Apr 25 2011 %C A135117 See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "10087". %H A135117 Makoto Kamada, <a href="https://stdkmd.net/nrr/prime/">List of near-repdigit-related prime numbers</a>. %H A135117 <a href="/index/Pri#Pri_rep">Index entries for primes involving repunits</a>. %e A135117 3 is a term because 10^3 + 87 = 1000 + 87 = 1087, which is a prime number. %Y A135117 Cf. A095688, A108052, A108050, A108312, A107083, A108049, A108054. %K A135117 nonn,more %O A135117 1,2 %A A135117 Julien Peter Benney (jpbenney(AT)gmail.com), Feb 12 2008 %E A135117 Term 14445 from _Robert Price_, Mar 22 2010 %E A135117 Terms 1243, 15273, 26779 from _Robert Price_, Oct 04 2010 %E A135117 Edited by _Ray Chandler_, Dec 23 2010