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 A077508 #7 May 28 2015 10:03:31
%S A077508 29,397,4999,59999,699967,7999993,89999999,999999937,1099999997,
%T A077508 11999999983,129999999949,1399999999949,14999999999981,
%U A077508 159999999999997,1699999999999967,17999999999999939,189999999999999941
%N A077508 Largest n-digit prime beginning with n.
%H A077508 Harvey P. Dale, <a href="/A077508/b077508.txt">Table of n, a(n) for n = 2..500</a>
%t A077508 Table[NextPrime[FromDigits[PadRight[{n+1},n-(IntegerLength[n]-1),0]],-1],{n,2,20}] (* _Harvey P. Dale_, May 28 2015 *)
%Y A077508 Cf. A077504, A077509.
%K A077508 base,nonn
%O A077508 2,1
%A A077508 _Amarnath Murthy_, Nov 08 2002
%E A077508 More terms from Francois Jooste (phukraut(AT)hotmail.com), Dec 23 2002
%E A077508 Corrected and extended by _Sascha Kurz_, Jan 04 2003