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 A077516 #9 Mar 17 2022 01:03:59 %S A077516 1,29,361,4997,0,699964,0,89999995,999887641,1099999504,0, %T A077516 129999999988,0,14999999996224,159999933195664,1699999999999998,0, %U A077516 189999999999999477,0,20999999999999999817,219999996968515384384,2299999999999999765504,0,249999999999999999999988 %N A077516 Largest n-digit number beginning with n and having n divisors, or 0 if no such number exists. %e A077516 a(4) = 4989 = 3*1663 has 4 divisors: 1, 3, 1663 and 4989. a(5) = 0 as 13^4 = 28561 < 50000 < 59999 < 83521 = 17^4. %Y A077516 Cf. A077515. %K A077516 base,nonn %O A077516 1,2 %A A077516 _Amarnath Murthy_, Nov 08 2002 %E A077516 Corrected and extended by _Ray Chandler_, Aug 15 2003 %E A077516 a(24) from _Jon E. Schoenfield_, Mar 17 2022