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 A124298 #11 Dec 15 2024 14:36:31 %S A124298 13,127,1259,12589,125887,1258847,12588461,125884529,1258845277, %T A124298 12588452743,125884527427,1258845274261,12588452742583, %U A124298 125884527425827,1258845274258259,12588452742582559,125884527425825569,1258845274258255681,12588452742582556787,125884527425825567809 %N A124298 Largest prime < 10*a(n-1), a(1)=13. %H A124298 Vincenzo Librandi, <a href="/A124298/b124298.txt">Table of n, a(n) for n = 1..200</a> %t A124298 NestList[NextPrime[10#, -1]&, 13, 30] (* _Vincenzo Librandi_, Jun 28 2014 *) %Y A124298 Cf. A124262. %K A124298 nonn %O A124298 1,1 %A A124298 _Artur Jasinski_, Dec 16 2006