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 A036935 #9 Mar 09 2020 10:26:39 %S A036935 0,11,181,1181,18181,0,1111181,11818181,111111181,1111111181, %T A036935 11111188811,0,1111111118111,11111111818181,111111111111881, %U A036935 1111111111111181,11111111111188111,0,1111111111111111111 %N A036935 Smallest n-digit prime containing only digits 1 and 8, or 0 if no such prime exists. %C A036935 a(6k) = 0 as any 6k-digit number containing only digits 1 or 8 is divisible by 7. - _Jinyuan Wang_, Mar 09 2020 %H A036935 Jinyuan Wang, <a href="/A036935/b036935.txt">Table of n, a(n) for n = 1..500</a> %Y A036935 Cf. A020456, A036229, A036308. %K A036935 nonn,base %O A036935 1,2 %A A036935 _Patrick De Geest_, Jan 04 1999