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 A082706 #19 Nov 10 2019 01:32:57 %S A082706 7,13,493,5569,24757 %N A082706 Numbers k such that (31*10^(k-1) - 13)/9 is a plateau prime. %C A082706 Prime versus probable prime status and proofs are given in the author's table. %D A082706 C. Caldwell and H. Dubner, "Journal of Recreational Mathematics", Volume 28, No. 1, 1996-97, pp. 1-9. %H A082706 Patrick De Geest, <a href="http://www.worldofnumbers.com/deplat.htm#pdp343">PDP Reference Table - 343</a>. %H A082706 Makoto Kamada, <a href="https://stdkmd.net/nrr/3/34443.htm#prime">Prime numbers of the form 344...443</a>. %H A082706 <a href="/index/Pri#Pri_rep">Index entries for primes involving repunits</a>. %F A082706 a(n) = A056253(n) + 2. %e A082706 k=13 -> (31*10^(13-1) - 13)/9 = 3444444444443. %Y A082706 Cf. A082697-A082720, A056253. %K A082706 nonn,base,hard,more %O A082706 1,1 %A A082706 _Patrick De Geest_, Apr 13 2003 %E A082706 More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008 %E A082706 Edited by _Ray Chandler_, Nov 05 2014