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 A082707 #18 Nov 10 2019 01:33:01 %S A082707 3,9,141,231,427,463,727,1975,7231,45861,47305 %N A082707 Numbers k such that (32*10^(k-1) - 23)/9 is a plateau prime. %C A082707 Prime versus probable prime status and proofs are given in the author's table. %D A082707 C. Caldwell and H. Dubner, "Journal of Recreational Mathematics", Volume 28, No. 1, 1996-97, pp. 1-9. %H A082707 Patrick De Geest, <a href="http://www.worldofnumbers.com/deplat.htm#pdp353">PDP Reference Table - 353</a>. %H A082707 Makoto Kamada, <a href="https://stdkmd.net/nrr/3/35553.htm#prime">Prime numbers of the form 355...553</a>. %H A082707 <a href="/index/Pri#Pri_rep">Index entries for primes involving repunits</a>. %F A082707 a(n) = A056254(n) + 2. %e A082707 k=9 -> (32*10^(9-1) - 23)/9 = 355555553. %Y A082707 Cf. A082697-A082720, A056254. %K A082707 nonn,base,hard,more %O A082707 1,1 %A A082707 _Patrick De Geest_, Apr 13 2003 %E A082707 More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008 %E A082707 Edited by _Ray Chandler_, Nov 05 2014