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 A108326 #23 Jan 17 2019 13:44:08 %S A108326 2,3,6,30,40,86,128,264,639,912,1932,4650,5038,7410,19041 %N A108326 Integers n such that 10^n-17 is prime. %C A108326 Terms 639 and 912 correspond to certified primes (Primo 2.2.0 beta). - _Ryan Propper_, Jul 12 2005 %C A108326 No other terms < 40000. %C A108326 See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "99983". %C A108326 No other terms < 100,000. - _Robert Price_, Mar 03 2011 %H A108326 Makoto Kamada, <a href="https://stdkmd.net/nrr/prime/">List of near-repdigit-related prime numbers</a>. %H A108326 <a href="/index/Pri#Pri_rep">Index entries for primes involving repunits</a>. %e A108326 If n = 3 we have 10^3-17 = 1000-17 = 983, which is prime. %Y A108326 Cf. A089675, A095714, A092767. %K A108326 more,nonn %O A108326 1,1 %A A108326 Julien Peter Benney (jpbenney(AT)ftml.net), Jun 30 2005 %E A108326 a(14)-a(15) from _Robert Price_, Dec 11 2010 %E A108326 Edited by _Ray Chandler_, Dec 23 2010