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 A178175 #18 Jan 17 2019 13:44:08 %S A178175 2,3,6,33,48,74,231,3206,4544,7064,13634,41384,64862,82790 %N A178175 Numbers n such that 10^n - 47 is prime. %C A178175 The next term, if one exists, is >100000. - _Robert Price_, Apr 25 2011 %C A178175 See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "99953". %H A178175 Makoto Kamada, <a href="https://stdkmd.net/nrr/prime/">List of near-repdigit-related prime numbers</a>. %H A178175 <a href="/index/Pri#Pri_rep">Index entries for primes involving repunits</a>. %e A178175 10^3 - 47 = 953 is a prime number. %t A178175 m=1000; For[n=1, n<m, If[PrimeQ[10^n-47], Print[n]];n++ ] %o A178175 (PARI) is(n)=ispseudoprime(10^n-47) \\ _Charles R Greathouse IV_, Jun 13 2017 %Y A178175 Cf. A108330, A108328. %K A178175 more,nonn %O A178175 1,1 %A A178175 _Robert Price_, Dec 17 2010 %E A178175 a(12:14)=41384,64862,82790 from _Robert Price_, Apr 25 2011