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 A062219 #15 Aug 11 2024 14:41:34 %S A062219 3,21,27,81,315,849,1893,2883,9591,14691 %N A062219 Numbers k such that the smoothly undulating palindromic number (37*10^k - 73)/99 is a prime. %C A062219 Prime versus probable prime status and proofs are given in the author's table. %C A062219 No further terms < 100000. - _Ray Chandler_, Aug 17 2011 %H A062219 P. De Geest, <a href="https://www.worldofnumbers.com/undulat.htm#supp373">SUPP Reference Table - 373</a> %H A062219 <a href="/index/Pri#pri_supp">Index entries for sequences related to smoothly undulating palindromic primes</a> %e A062219 k=21 -> (37*10^21 - 73)/99 = 373737373737373737373. %Y A062219 Cf. A062209-A062232, A059758, A032758. %K A062219 nonn,base %O A062219 1,1 %A A062219 _Patrick De Geest_ and Hans Rosenthal (Hans.Rosenthal(AT)t-online.de), Jun 15 2001 %E A062219 Edited by _Ray Chandler_, Aug 17 2011