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 A108328 #28 Jan 17 2019 13:44:08
%S A108328 3,11,17,23,35,161,765,3473,6887,27681,34313
%N A108328 Integers n such that 10^n - 23 is a prime number.
%C A108328 No additional terms < 40000. - _Robert Price_, Dec 13 2010
%C A108328 See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "99977".
%C A108328 No other terms < 100,000. - _Robert Price_, Mar 03 2011
%H A108328 Makoto Kamada, <a href="https://stdkmd.net/nrr/prime/">List of near-repdigit-related prime numbers</a>.
%H A108328 <a href="/index/Pri#Pri_rep">Index entries for primes involving repunits</a>.
%e A108328 n = 3 is a member because 10^3 - 23 = 1000 - 23 = 977, which is prime.
%t A108328 lst={};Do[If[PrimeQ[10^n-23], AppendTo[lst, n]], {n, 0, 10^4}];lst (* _Vladimir Joseph Stephan Orlovsky_, Aug 19 2008 *)
%Y A108328 Cf. A089675, A095714, A092767.
%K A108328 more,nonn
%O A108328 1,1
%A A108328 Julien Peter Benney (jpbenney(AT)ftml.net), Jun 30 2005
%E A108328 a(9)-a(11) from _Robert Price_, Dec 13 2010
%E A108328 Edited by _Ray Chandler_, Dec 23 2010