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 A124263 #17 Dec 15 2024 14:27:33 %S A124263 3,29,283,2819,28183,281807,2818043,28180393,281803927,2818039241, %T A124263 28180392407,281803924067,2818039240619,28180392406171, %U A124263 281803924061641,2818039240616359,28180392406163579,281803924061635783,2818039240616357827,28180392406163578069,281803924061635780589 %N A124263 Largest prime < 10*a(n-1), a(1)=3. %H A124263 Vincenzo Librandi, <a href="/A124263/b124263.txt">Table of n, a(n) for n = 1..200</a> %t A124263 NestList[NextPrime[10#,-1]&,3,20] (* _Harvey P. Dale_, Jun 10 2011 *) %Y A124263 Cf. A124262. %K A124263 nonn %O A124263 1,1 %A A124263 _Artur Jasinski_, Dec 16 2006