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 A082697 #23 Nov 04 2019 02:21:32 %S A082697 3,5,7,95,161,361,1471,2899,3095,3113,15699,17957,42263,111033 %N A082697 Numbers k such that (4*10^(k-1) - 7)/3 is a plateau prime. %C A082697 Prime versus probable prime status and proofs are given in the author's table. %D A082697 C. Caldwell and H. Dubner, "Journal of Recreational Mathematics", Volume 28, No. 1, 1996-97, pp. 1-9. %H A082697 Patrick De Geest, <a href="http://www.worldofnumbers.com/deplat.htm#pdp131">PDP Reference Table - 131</a>. %H A082697 Makoto Kamada, <a href="https://stdkmd.net/nrr/1/13331.htm#prime">Prime numbers of the form 133...331</a>. %H A082697 <a href="/index/Pri#Pri_rep">Index entries for primes involving repunits</a>. %F A082697 a(n) = A056244(n+1) + 2. %e A082697 k=7 -> (4*10^(7-1) - 7)/3 = 1333331. %Y A082697 Cf. A056244, A068645, A082698-A082720. %K A082697 nonn,base %O A082697 1,1 %A A082697 _Patrick De Geest_, Apr 13 2003 %E A082697 a(13)=42263 from _Patrick De Geest_, Oct 03 2004 %E A082697 a(14)=111033 from _Ray Chandler_, Apr 14 2011 %E A082697 Edited by _Ray Chandler_, Nov 04 2014