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 A124291 #11 Dec 15 2024 14:33:33 %S A124291 7,67,661,6607,66067,660661,6606581,66065773,660657713,6606577129, %T A124291 66065771269,660657712667,6606577126663,66065771266577, %U A124291 660657712665739,6606577126657373,66065771266573693,660657712665736927,6606577126657369171,66065771266573691611,660657712665736916107 %N A124291 Largest prime < 10*a(n-1), a(1)=7. %H A124291 Vincenzo Librandi, <a href="/A124291/b124291.txt">Table of n, a(n) for n = 1..200</a> %t A124291 NestList[NextPrime[10 #, - 1]&, 7, 30] (* _Vincenzo Librandi_, Jun 28 2014 *) %Y A124291 Cf. A124262. %K A124291 nonn %O A124291 1,1 %A A124291 _Artur Jasinski_, Dec 16 2006