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 A124335 #11 Dec 15 2024 15:46:24 %S A124335 31,307,3067,30661,306589,3065863,30658619,306586169,3065861681, %T A124335 30658616789,306586167863,3065861678629,30658616786249, %U A124335 306586167862427,3065861678624219,30658616786242157,306586167862421549,3065861678624215469,30658616786242154603,306586167862421546017 %N A124335 Largest prime < 10*a(n-1), a(1)=31. %H A124335 Vincenzo Librandi, <a href="/A124335/b124335.txt">Table of n, a(n) for n = 1..200</a> %t A124335 NestList[NextPrime[10 #, -1]&, 31, 30] (* _Vincenzo Librandi_, Jun 28 2014 *) %Y A124335 Cf. A124262. %K A124335 nonn %O A124335 1,1 %A A124335 _Artur Jasinski_, Dec 16 2006