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 A062216 #17 Aug 11 2024 14:41:34 %S A062216 3,51,83,225,561,10419,18255,43869 %N A062216 Numbers k such that the smoothly undulating palindromic number (31*10^k - 13)/99 is a prime. %C A062216 Prime versus probable prime status and proofs are given in the author's table. %C A062216 No further terms < 100000. - _Ray Chandler_, Aug 17 2011 %H A062216 P. De Geest, <a href="https://www.worldofnumbers.com/undulat.htm#supp313">SUPP Reference Table - 313</a> %H A062216 <a href="/index/Pri#pri_supp">Index entries for sequences related to smoothly undulating palindromic primes</a> %e A062216 k=51 -> (31*10^51 - 13)/99 = 313131313131313131313131313131313131313131313131313. %Y A062216 Cf. A062209-A062232, A059758, A032758. %K A062216 nonn,base %O A062216 1,1 %A A062216 _Patrick De Geest_ and Hans Rosenthal (Hans.Rosenthal(AT)t-online.de), Jun 15 2001 %E A062216 43869 from _Ray Chandler_, Sep 30 2010 %E A062216 Edited by _Ray Chandler_, Aug 17 2011