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 A108506 #23 Jan 17 2019 13:44:08 %S A108506 2,3,4,8,20,38,95,248,263,303,304,410,438,548,688,1074,1575,8364,9910, %T A108506 15910,37344 %N A108506 Integers n such that 10^n-59 is prime. %C A108506 Certified primality of numbers corresponding to terms 410, 438, 548, 688, 1074 and 1575 with Primo. - _Ryan Propper_, Jul 08 2005 %C A108506 No other terms <40000. %C A108506 See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "99941". %H A108506 Makoto Kamada, <a href="https://stdkmd.net/nrr/prime/">List of near-repdigit-related prime numbers</a>. %H A108506 <a href="/index/Pri#Pri_rep">Index entries for primes involving repunits</a>. %e A108506 8 is a member because: n = 8 gives 10^8-59 = 100000000-59 = 99999941, which is prime. %Y A108506 Cf. A089675, A095714, A092767, A108327, A108328, A108329, A108330, A108331, A108332, A177418. %K A108506 more,nonn %O A108506 1,1 %A A108506 Julien Peter Benney (jpbenney(AT)ftml.net), Jul 06 2005 %E A108506 a(18)-a(20) from Kamada data by _Robert Price_, Dec 10 2010 %E A108506 a(21) by _Robert Price_, Dec 16 2010 %E A108506 Edited by _Ray Chandler_, Dec 23 2010