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 A059671 #16 Apr 03 2023 12:00:12
%S A059671 2,3,8,11,15,39,60,72,77,117,183,252,396,1745,2843,4665,5364,524427
%N A059671 Numbers n such that n*10^n - 1 is prime.
%C A059671 No further terms up to 500000 (see Harvey link). - _Ray Chandler_, Apr 10 2016
%D A059671 J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 117, p. 41, Ellipses, Paris 2008.
%H A059671 Steven Harvey, <a href="http://harvey563.tripod.com/GeneralizedWoodallPrimes.txt">Generalized Woodall Search</a>
%H A059671 Prime Pages, <a href="https://t5k.org/top20/page.php?id=45">Top 20, Generalized Woodall</a>
%H A059671 Prime-Wiki, <a href="https://www.rieselprime.de/ziki/Woodall_prime_10">Generalized Woodall primes of the form n*10^n-1</a>
%t A059671 Do[ If[ PrimeQ[ n*10^n - 1 ], Print[ n ] ], {n, 1, 2500} ]
%o A059671 (PARI) is(n)=ispseudoprime(n*10^n-1) \\ _Charles R Greathouse IV_, Mar 01 2017
%K A059671 nonn
%O A059671 1,1
%A A059671 _Robert G. Wilson v_, Feb 05 2001
%E A059671 a(15) - a(17) from _Farideh Firoozbakht_, Apr 01 2009
%E A059671 a(18) communicated by _Jeppe Stig Nielsen_, Apr 03 2023