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 A069662 #4 Dec 05 2013 19:55:16 %S A069662 7,89,997,8999,99989,989999,9899999,99999989,998999999,9999898999, %T A069662 99989999999,999999999989,9999999999799,99999999899999, %U A069662 999999999999989,9999999999989999,99999999999899999,999999999999999989,9998999999999999999,99999999999999999989 %N A069662 Largest n-digit prime with maximum digit sum. %Y A069662 Cf. A069661, A020472 (primes with digits 8 and 9 only), A003618 (largest n-digit prime). %K A069662 nonn,base %O A069662 1,1 %A A069662 _Amarnath Murthy_, Apr 05 2002 %E A069662 More terms from _Rick L. Shepherd_, Jul 15 2002. a(5) through a(20) have been certified prime with Primo.