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 A082708 #24 Nov 10 2019 01:33:05 %S A082708 3,15,55,69,85,87,157,2767,3381,3877,5209,10747,15769,31317,40959, %T A082708 45805,46567,51009,80163 %N A082708 Numbers k such that (34*10^(k-1) - 43)/9 is a plateau prime. %C A082708 Prime versus probable prime status and proofs are given in the author's table. %D A082708 C. Caldwell and H. Dubner, "Journal of Recreational Mathematics", Volume 28, No. 1, 1996-97, pp. 1-9. %H A082708 Patrick De Geest, <a href="http://www.worldofnumbers.com/deplat.htm#pdp373">PDP Reference Table - 373</a>. %H A082708 Makoto Kamada, <a href="https://stdkmd.net/nrr/3/37773.htm#prime">Prime numbers of the form 377...773</a>. %H A082708 <a href="/index/Pri#Pri_rep">Index entries for primes involving repunits</a>. %F A082708 a(n) = A056255(n) + 2. %e A082708 k=15 -> (34*10^(15-1) - 43)/9 = 377777777777773. %Y A082708 Cf. A082697-A082720, A056255. %K A082708 nonn,base,hard,more %O A082708 1,1 %A A082708 _Patrick De Geest_, Apr 13 2003 %E A082708 Updates from De Geest site by Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008 %E A082708 a(18)=51009 from _Ray Chandler_, Nov 16 2010 %E A082708 a(19)=80163 from _Ray Chandler_, Dec 15 2010 %E A082708 Edited by _Ray Chandler_, Nov 05 2014