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 A068163 #8 Jan 31 2024 01:05:31 %S A068163 919,990599,99901999,9999049999,99999199999,99999901999999, %T A068163 9999999239999999,99999999299999999,9999999992999999999, %U A068163 9999999999049999999999,999999999990599999999999,99999999999904999999999999 %N A068163 Smallest prime beginning and ending in at least n 9's. %e A068163 a(2) = 990599 is a prime that starts with 99 and ends in 99. %Y A068163 Cf. A068160, A068161, A068162. %K A068163 base,nonn %O A068163 1,1 %A A068163 _Amarnath Murthy_, Feb 24 2002 %E A068163 More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Mar 31 2003